Kudos for everyone who wore a costume today to celebrate Sunday's spooky holiday. Everyone looked great!
Honors Physics reviewed their power homework before walking through the chapter as a general review for Monday's exam. On Wednesday, you'll conduct a lab investigation on the Impulse-Momentum Theorem, which we'll discuss in class on Thursday.
Physics B and F reviewed their work and power homework before stepping into the world of energy. Not all forms of energy are easily available to do work - chemical and nuclear, for example - but the ones that are will be the focus of this unit. We started with gravitational potential energy and described how position in a gravitational field and mass affect an object's PEg. We'll add elastic potential energy and kinetic energy to the pot next week. On Monday, B Block will conduct a lab investigation that allows folks to see the various types of energy in action and focuses on the big-ticket item that is conservation of energy.
Physical Science took their forces math quiz before taking the tiniest of peeks at momentum. We'll discuss momentum in more detail on Monday and conduct a lab investigation on momentum on Thursday.
Homework
Honors Physics: Prepare for exam
Physics B and F: None
Physical Science: None
10/29/10
10/28/10
What's With the Weather?
This school year has started with the weirdest weather. Ever. That's all I have to say.
Honors Physics went over their work and energy homework problems before turning attention to power. Be very aware that power is the rate at which work is done or energy is converted, not the amount of each in question. We discussed a number of examples where the amount of work done by two machines was identical, although the power varied dramatically. We'll tidy up loose ends with power tomorrow before engaging in a general review in preparation for Monday's exam.
Physics B and F began their unit on work and energy. We defined work and discussed how force and distance play into the calculation of work. Positive and negative work examples were described and we then took time to look at the rate at which work is done - power. Be very clear about the scientific definitions of work and power and recognize examples of when work is being done by a force and when a force is not doing work on an object.
Physical Science had a discussion on Newton's 3rd Law of Motion. Keep in mind that the "action" and "reaction" terms for N3 refer to the forces involved and not the responses of the objects after experiencing those forces. When two objects interact, two forces are simultaneously generated, equal in magnitude and opposite in direction, but we have to go back to N2 to figure out what acceleration the forces impart on the individual objects. Also, remember that these forces do not produce equilibrium. They do not represent an example of balanced forces - the forces act on different objects. Tomorrow, another forces math quiz before starting to take a look at momentum.
Homework
Honors Physics: Practice 5F and the section review on p. 189
Physics B and F: p. 119 of packet #1-5, 21-23 and p. 171 of textbook #1-4
Physical Science: Study for forces math quiz
Honors Physics went over their work and energy homework problems before turning attention to power. Be very aware that power is the rate at which work is done or energy is converted, not the amount of each in question. We discussed a number of examples where the amount of work done by two machines was identical, although the power varied dramatically. We'll tidy up loose ends with power tomorrow before engaging in a general review in preparation for Monday's exam.
Physics B and F began their unit on work and energy. We defined work and discussed how force and distance play into the calculation of work. Positive and negative work examples were described and we then took time to look at the rate at which work is done - power. Be very clear about the scientific definitions of work and power and recognize examples of when work is being done by a force and when a force is not doing work on an object.
Physical Science had a discussion on Newton's 3rd Law of Motion. Keep in mind that the "action" and "reaction" terms for N3 refer to the forces involved and not the responses of the objects after experiencing those forces. When two objects interact, two forces are simultaneously generated, equal in magnitude and opposite in direction, but we have to go back to N2 to figure out what acceleration the forces impart on the individual objects. Also, remember that these forces do not produce equilibrium. They do not represent an example of balanced forces - the forces act on different objects. Tomorrow, another forces math quiz before starting to take a look at momentum.
Homework
Honors Physics: Practice 5F and the section review on p. 189
Physics B and F: p. 119 of packet #1-5, 21-23 and p. 171 of textbook #1-4
Physical Science: Study for forces math quiz
10/26/10
Momentous Tuesday
Physics F conducted a lab investigation that allowed students to examine the effects of velocity and mass on an object's momentum. As predicted by the momentum formula (p = mv), increasing either variable increases momentum and by a predictable amount. Double one and momentum also doubles, etc. The write up for the lab is due on Thursday, because you have more important things to worry about tonight - tomorrow's momentum exam!
Physics B went over their momentum review sheet before conducting a general review of the chapter. Some people took extra problems to work that give you an idea of what types of problems you might see on the test. Starting on Thursday - Work and Energy!
Physics B and F - SOLUTIONS TO EXTRA MOMENTUM PROBLEMS AVAILABLE HERE!!!
Honors Physics built on last week's discussion of work and kinetic energy by adding gravitational potential energy and elastic potential energy to the fix. Both are energies of position and both represent a storehouse of energy available to do work. To get that energy stored up, work had to be done on the object (lifting it to a height, compressing/stretching an elastic material) and you can equate the amount of work done on the object the amount of energy stored. Release that energy, and that is how much the object can do. Tomorrow, we'll go over the lab and use it as an example as we discuss conservation of energy.
Physical Science went over their quizzes and then started work on another set of similar problems. Folks didn't do so well on this quiz, so more practice is indicated and there will be another quiz on the same three problem-solving areas on Friday.
Homework
Honors Physics: 5.1 and 5.2 Section Reviews
Physics B and F: Study for exam. Physics F should complete lab write up by Thursday
Physical Science: Complete Forces Review problems
P
Physics B went over their momentum review sheet before conducting a general review of the chapter. Some people took extra problems to work that give you an idea of what types of problems you might see on the test. Starting on Thursday - Work and Energy!
Physics B and F - SOLUTIONS TO EXTRA MOMENTUM PROBLEMS AVAILABLE HERE!!!
Honors Physics built on last week's discussion of work and kinetic energy by adding gravitational potential energy and elastic potential energy to the fix. Both are energies of position and both represent a storehouse of energy available to do work. To get that energy stored up, work had to be done on the object (lifting it to a height, compressing/stretching an elastic material) and you can equate the amount of work done on the object the amount of energy stored. Release that energy, and that is how much the object can do. Tomorrow, we'll go over the lab and use it as an example as we discuss conservation of energy.
Physical Science went over their quizzes and then started work on another set of similar problems. Folks didn't do so well on this quiz, so more practice is indicated and there will be another quiz on the same three problem-solving areas on Friday.
Homework
Honors Physics: 5.1 and 5.2 Section Reviews
Physics B and F: Study for exam. Physics F should complete lab write up by Thursday
Physical Science: Complete Forces Review problems
P
10/25/10
Charging Into A New Week
Honors Physics completed the conservation of energy labs that they began on Friday. A tossed ball demonstrated conservation of energy between kinetic and gravitational potential conversions and a mass-spring system did the same for kinetic and elastic potential energy. The total in the system remains the same, but the values for individual forms and types can, and do, change. We'll continue our energy discussion in class tomorrow and by Wednesday, should be ready to look at COE using your labs as as examples.
Physics B contrasted perfectly inelastic, inelastic and elastic collisions based on such factors as kinetic energy conservation, deformation of objects and momentum conservation. All conserve momentum, but other factors do vary between types of object interactions. Time was then provided for students to begin working on their review packet for Wednesday's exam.
Physics F went over their exam review packet and addressed any final questions about momentum. Tomorrow's lab should help to cement things prior to the exam on Wednesday.
Physical Science took a quiz for Newton's 2nd Law of Motion, weight and gravity problems. We'll go over the quiz in class tomorrow. Then, a lab investigation was launched to look at air resistance. We discussed air resistance in class Friday, including how it varied with the mass, speed and shape of an object. Tomorrow, we'll go over the lab before moving on with projectile motion.
Homework
Honors Physics: Lab write up due Wednesday
Physics B: Complete momentum review packet
Physics F: None
Physical Science: Complete lab write up
Physics B contrasted perfectly inelastic, inelastic and elastic collisions based on such factors as kinetic energy conservation, deformation of objects and momentum conservation. All conserve momentum, but other factors do vary between types of object interactions. Time was then provided for students to begin working on their review packet for Wednesday's exam.
Physics F went over their exam review packet and addressed any final questions about momentum. Tomorrow's lab should help to cement things prior to the exam on Wednesday.
Physical Science took a quiz for Newton's 2nd Law of Motion, weight and gravity problems. We'll go over the quiz in class tomorrow. Then, a lab investigation was launched to look at air resistance. We discussed air resistance in class Friday, including how it varied with the mass, speed and shape of an object. Tomorrow, we'll go over the lab before moving on with projectile motion.
Homework
Honors Physics: Lab write up due Wednesday
Physics B: Complete momentum review packet
Physics F: None
Physical Science: Complete lab write up
10/24/10
10/22/10
It's Friday, I'm in Love
With trashy action flicks...Time for a Pitch Black/Chronicles of Riddick movie fest with some Mortal Kombat: Annihilation tossed in for good measure...
Honors Physics started a series of lab investigations concerning conservation of energy. The first examined energy changes in a tossed ball and demonstrated patterns of energy change between kinetic and gravitational potential energy. The second targets energy in simple harmonic motion and tracks kinetic and elastic potential energy conversions in a mass-spring system. We'll finish up the lab work on Monday, so the lab write up wont' be due until Tuesday. Also on Tuesday, we jump deeply into energy with a detailed look of the various forms and types.
Physics B discussed conservation of energy and used last week's lab unit as an example. Regardless of type of collision, total momentum before the interaction equals the total momentum after the interaction, but the same cannot be said for energy of motion (kinetic energy). We'll classify collisions based on their ability to conserve kinetic energy (and other factors) on Monday.
Physics F went over their homework questions/problems and were then given review work to start on in preparation for Wednesday's exam. We'll go over this information, do a general review of momentum and conduct one extra lab investigation before the test.
Physical Science reviewed the homework problems for Newton's 2nd Law of Motion and weight before looking more closely at free-fall acceleration. We added in the force of air resistance, today and discussed its effects on falling objects. The concept of terminal velocity was introduced and explained and linked to the reason that, in the absence of a vacuum, more massive objects do hit the ground before less massive objects. We then began a look at projectile motion that we will continue on Tuesday. Monday finds students taking a short quiz on the math skills they've practiced so far for forces and then embarking on a lab investigation for air resistance.
Homework
Honors Physics: None
Physics B: p. 101 in Packet #14, 15, 28, 29
Physics F: Complete momentum review packet
Physical Science: Study for forces math quiz
Honors Physics started a series of lab investigations concerning conservation of energy. The first examined energy changes in a tossed ball and demonstrated patterns of energy change between kinetic and gravitational potential energy. The second targets energy in simple harmonic motion and tracks kinetic and elastic potential energy conversions in a mass-spring system. We'll finish up the lab work on Monday, so the lab write up wont' be due until Tuesday. Also on Tuesday, we jump deeply into energy with a detailed look of the various forms and types.
Physics B discussed conservation of energy and used last week's lab unit as an example. Regardless of type of collision, total momentum before the interaction equals the total momentum after the interaction, but the same cannot be said for energy of motion (kinetic energy). We'll classify collisions based on their ability to conserve kinetic energy (and other factors) on Monday.
Physics F went over their homework questions/problems and were then given review work to start on in preparation for Wednesday's exam. We'll go over this information, do a general review of momentum and conduct one extra lab investigation before the test.
Physical Science reviewed the homework problems for Newton's 2nd Law of Motion and weight before looking more closely at free-fall acceleration. We added in the force of air resistance, today and discussed its effects on falling objects. The concept of terminal velocity was introduced and explained and linked to the reason that, in the absence of a vacuum, more massive objects do hit the ground before less massive objects. We then began a look at projectile motion that we will continue on Tuesday. Monday finds students taking a short quiz on the math skills they've practiced so far for forces and then embarking on a lab investigation for air resistance.
Homework
Honors Physics: None
Physics B: p. 101 in Packet #14, 15, 28, 29
Physics F: Complete momentum review packet
Physical Science: Study for forces math quiz
10/21/10
Thrilling Thursday
Well, for Physics B, at least, who got to crash dynamics carts into 3-ring binders to study momentum. The role of velocity and mass in determining an object's momentum was investigated today. Both mass and velocity have a directly proportional relationship with momentum. Double either and the momentum is doubled, for example. The carts launched at highest velocity had the highest momentum and doubling the cart's mass doubled his momentum, for each velocity tested. We'll go over the lab tomorrow and begin a discussion of conservation of momentum. Did you think about the fact that, in lab today, that when the cart hit the binder, the binder gained momentum and the cart lost some? That's what we'll hit with tomorrow' discussion.
Physics F contrasted elastic, perfectly inelastic and inelastic collisions after reviewing the impulse and conservation of momentum homework. All collisions, in the absence of pesky things like friction and other outside forces demonstrate conservation of momentum (even when they occur in a 2-dimensional motion framework), but only the purely elastic ones also conserve kinetic energy. The questions/problems you have tonight will help disentangle collision types and give you practice making predictions based on the momentum of objects in a system.
Honors Physics reviewed their forces exam before launching into a discussion of work and kinetic energy. For work, remember that Worknetis based on the net force acting on an object, but we can evaluate the work provided by single forces, if necessary. Work, although considered a scalar value, is flavored positive or negative and make sure you can describe what positive or negative work means in terms of an object's motion and energy state. We also hit the work-kinetic energy theorem today and will broaden that idea when we discuss potential energy next week. Tomorrow, a lab centering on energy in two distinct systems - a ball in free fall and an oscillating spring - and how well energy is conserved in both.
Physical Science took one last look at the mathematical aspects of Newton's Law of Universal Gravitation before discussing free-fall acceleration and weight. Make sure you are very clear about the difference between mass and weight, and also that you don't confuse "g" with "G" in problem solving. Both values are given on the MCAS formula sheet and you need to know which one to use in a given situation. Tomorrow, we'll go over the homework problems for weight and Newton's 2nd Law of Motion before expanding our discussion free-fall with an exploration of air resistance and terminal velocity.
Homework
Honors Physics: None, but a reading of the energy bits of this chapter will make the lab activity tomorrow easier to understand
Physics B: Complete lab write up for the Impulse-Momentum work and today's Momentum lab
Physics F: Complete p. 100-101 of ancillary packet #16-22, 27
Physical Science: Complete the Chapter 11 Chapter Review #22-29
Physics F contrasted elastic, perfectly inelastic and inelastic collisions after reviewing the impulse and conservation of momentum homework. All collisions, in the absence of pesky things like friction and other outside forces demonstrate conservation of momentum (even when they occur in a 2-dimensional motion framework), but only the purely elastic ones also conserve kinetic energy. The questions/problems you have tonight will help disentangle collision types and give you practice making predictions based on the momentum of objects in a system.
Honors Physics reviewed their forces exam before launching into a discussion of work and kinetic energy. For work, remember that Worknetis based on the net force acting on an object, but we can evaluate the work provided by single forces, if necessary. Work, although considered a scalar value, is flavored positive or negative and make sure you can describe what positive or negative work means in terms of an object's motion and energy state. We also hit the work-kinetic energy theorem today and will broaden that idea when we discuss potential energy next week. Tomorrow, a lab centering on energy in two distinct systems - a ball in free fall and an oscillating spring - and how well energy is conserved in both.
Physical Science took one last look at the mathematical aspects of Newton's Law of Universal Gravitation before discussing free-fall acceleration and weight. Make sure you are very clear about the difference between mass and weight, and also that you don't confuse "g" with "G" in problem solving. Both values are given on the MCAS formula sheet and you need to know which one to use in a given situation. Tomorrow, we'll go over the homework problems for weight and Newton's 2nd Law of Motion before expanding our discussion free-fall with an exploration of air resistance and terminal velocity.
Homework
Honors Physics: None, but a reading of the energy bits of this chapter will make the lab activity tomorrow easier to understand
Physics B: Complete lab write up for the Impulse-Momentum work and today's Momentum lab
Physics F: Complete p. 100-101 of ancillary packet #16-22, 27
Physical Science: Complete the Chapter 11 Chapter Review #22-29
10/20/10
More on Momentum
Physics B completed their impulse-momentum labs today and it was quickly evident that more elastic materials stretched their forces over long time intervals, delivering less of a force to the carts to which they were attached. If you were a passenger in that cart, that would mean you would experience the slowing down, stopping, changing direction and speeding up more gently than would a passenger in the cart attached to the less elastic material. We'll discuss the lab in class tomorrow, so you'll have the impulse-momentum lecture and lab discussion under your belt before you go to complete the lab write up. Tomorrow also finds folks conducting another lab, this one on how manipulating mass and velocity affect an on object's momentum.
Physics F had a discussion of conservation of momentum today. Momentum is conserved in interactions, when outside forces are lacking. When one object loses momentum, it is gained by the second object in the interaction. The resulting velocity change can be predicted using this principle. The transfer of momentum between objects was demonstrated and the special circumstance of conservation of momentum in stationary systems (cannon/cannon ball; gun/bullet). Tomorrow, we'll go over the homework questions before examining the types and properties of collisions.
Honors Physics took their forces and laws of motion exam and tomorrow finds students engaged in a discussion of work.
Physical Science took a step off the path to review the basic math skills of cross-multiplication and isolating variables in simple algebraic expressions. Students were also highly encouraged to practice with their calculators to become quick and efficient working common functions such as inputting values in scientific notation, squaring values and taking square-roots and working with multi-variable numerators and/or denominators when dealing with fractions. The MCAS exam allows you to use your own calculator, so it is very much to your benefit to become adept with it as soon as possible. Students were then given more time to work the gravitational forces problems and should complete those for homework.
Homework
Honors Physics: None
Physics B: None
Physics E: p. 100-101 of ancillary packet #2, 7, 12, 14, 15, 26
Physical Science: Complete gravitational forces worksheet problems
Physics F had a discussion of conservation of momentum today. Momentum is conserved in interactions, when outside forces are lacking. When one object loses momentum, it is gained by the second object in the interaction. The resulting velocity change can be predicted using this principle. The transfer of momentum between objects was demonstrated and the special circumstance of conservation of momentum in stationary systems (cannon/cannon ball; gun/bullet). Tomorrow, we'll go over the homework questions before examining the types and properties of collisions.
Honors Physics took their forces and laws of motion exam and tomorrow finds students engaged in a discussion of work.
Physical Science took a step off the path to review the basic math skills of cross-multiplication and isolating variables in simple algebraic expressions. Students were also highly encouraged to practice with their calculators to become quick and efficient working common functions such as inputting values in scientific notation, squaring values and taking square-roots and working with multi-variable numerators and/or denominators when dealing with fractions. The MCAS exam allows you to use your own calculator, so it is very much to your benefit to become adept with it as soon as possible. Students were then given more time to work the gravitational forces problems and should complete those for homework.
Homework
Honors Physics: None
Physics B: None
Physics E: p. 100-101 of ancillary packet #2, 7, 12, 14, 15, 26
Physical Science: Complete gravitational forces worksheet problems
10/19/10
Gathering Momentum
Physics B started a two-day investigation on the Impulse-Momentum theorem, which states that an object's observed momentum change is the product of the net applied force and the duration of the force's application. We'll finish up the lab in class tomorrow and, as you begin thinking about your write up, reflect on what we discussed about impulse and momentum yesterday in class. You'll get your exams back tomorrow morning and test corrections will be due on Monday.
Physics F discussed their lab investigation and launched into a general discussion of momentum and impulse. Use today's discussion to help frame the conclusions section of your lab write up, which is due tomorrow. Tomorrow, we'll start looking at conservation of momentum, which comes about because of Newton's 3rd Law of Motion. Test corrections are due on Monday, so make sure to get help from me, if needed, before then.
Honors Physics went over their review problems and had a general review for tomorrow's exam. Remember to have those problems with you to turn in before the test tomorrow. Starting Thursday, its off to Work!
Physical Science reviewed Newton's Law of Universal Gravitation and received a set of problems to work using this law. The start was rocky, so we'll take more time in class to work on them. The answers to that sheet are below, if you decide to try to make more headway tonight.
Homework
Honors Physics: Prepare for exam
Physics B: None
Physics F: Complete lab write up
Physical Science: None
Physics F discussed their lab investigation and launched into a general discussion of momentum and impulse. Use today's discussion to help frame the conclusions section of your lab write up, which is due tomorrow. Tomorrow, we'll start looking at conservation of momentum, which comes about because of Newton's 3rd Law of Motion. Test corrections are due on Monday, so make sure to get help from me, if needed, before then.
Honors Physics went over their review problems and had a general review for tomorrow's exam. Remember to have those problems with you to turn in before the test tomorrow. Starting Thursday, its off to Work!
Physical Science reviewed Newton's Law of Universal Gravitation and received a set of problems to work using this law. The start was rocky, so we'll take more time in class to work on them. The answers to that sheet are below, if you decide to try to make more headway tonight.
- 5.0 x 1015 kg
- 2.26 x 104 kg
- 80.6 kg
- 52 m
- 26,000 m or 26 km
- 1.0 x 10-2 N
Homework
Honors Physics: Prepare for exam
Physics B: None
Physics F: Complete lab write up
Physical Science: None
10/18/10
A Gathering of Forces
Honors Physics reviewed their friction homework problems before moving on to a specific type of friction - air resistance. We discussed the fact that the value for air resistance is not constant between surfaces, but varies with speed and the practical applications that had for engineering high-velocity vehicles and spacecraft. We also looked at how this variable nature of air resistance works to create an maximum limit to the speed of objects in free fall - terminal velocity - and how air resistance makes heavier objects hit the ground faster and at a higher velocity than lighter objects. We will go over the review homework problems tomorrow before engaging in a general review of the chapter in preparation for Wednesday's exam.
Physics began their discussion of momentum and impulse. Momentum is a quantity possessed by any object in motion, but by no object that is at rest. Make sure you are very clear about the difference between momentum and inertia. We then spent time discussing the impulse-momentum theorem and what implication it has for sports, martial arts and safety engineering. Tomorrow, we'll go over the homework questions and then start a lab investigation on the impulse-momentum theorem.
Physics F completed their investigation on the impulse-momentum theorem. Sure enough, the more elastic the band, the greater the time for the change of momentum to occur and the lower overall force on the cart. We'll go over the lab in more detail tomorrow as we begin our discussion of impulse and momentum.
Physical Science reviewed their Newton's 2nd Law of Motion homework problems before starting their discussion of gravity. Gravity is a force that is generated by all matter, but the magnitude of the force acting on a second object depends on the mass of the objects involved and the distance between them. We looked at Newton's formula to determine the value for the gravitational attraction between objects and took time to practice with this formula in class. Tomorrow a tasty problem set working with gravity!
Homework
Honors Physics: Chapter 4 Chapter Review # 52, 55, 57
Physics B: p. 100 in ancillary reading packet #1-10, 19
Physics F: None
Physical Science: None
Physics began their discussion of momentum and impulse. Momentum is a quantity possessed by any object in motion, but by no object that is at rest. Make sure you are very clear about the difference between momentum and inertia. We then spent time discussing the impulse-momentum theorem and what implication it has for sports, martial arts and safety engineering. Tomorrow, we'll go over the homework questions and then start a lab investigation on the impulse-momentum theorem.
Physics F completed their investigation on the impulse-momentum theorem. Sure enough, the more elastic the band, the greater the time for the change of momentum to occur and the lower overall force on the cart. We'll go over the lab in more detail tomorrow as we begin our discussion of impulse and momentum.
Physical Science reviewed their Newton's 2nd Law of Motion homework problems before starting their discussion of gravity. Gravity is a force that is generated by all matter, but the magnitude of the force acting on a second object depends on the mass of the objects involved and the distance between them. We looked at Newton's formula to determine the value for the gravitational attraction between objects and took time to practice with this formula in class. Tomorrow a tasty problem set working with gravity!
Homework
Honors Physics: Chapter 4 Chapter Review # 52, 55, 57
Physics B: p. 100 in ancillary reading packet #1-10, 19
Physics F: None
Physical Science: None
10/17/10
10/15/10
Phinally Phriday...
Wow, for a short week, it sure has been a long one...
Honors Physics reviewed their homework problem for normal force, net force and acceleration before pole-vaulting into friction. Static and kinetic friction were contrasted the the nature of the coefficient of friction was described. To work problems with friction, proper calculation of the normal force is required, which is why we spent additional time on that topic yesterday. We'll go over the work on Monday, have a brief discussion on air resistance and then begin the review process for Wednesday's exam.
Physics B and F took their Forces exam, but since F was long block, Physics F got to begin a lab on the Impulse-Momentum Theorem. We start discussing momentum in B Block on Monday and F Block will have time to complete their labs.
Physical Science reviewed their N-2 lab before reviewing their N-2 homework assignment from Wednesday. The lab nicely demonstrated that when applied force is held constant, increasing mass decreases acceleration and decreasing mass increases acceleration, in accordance with Newton's 2nd Law of Motion. Students then received a series of practice problems for N-2, which snuck in good things like unit conversions and calculations of acceleration. The answers to those problems are provided below, but we will go over them in class on Monday, as well.
Homework
Honors Physics: 4C #2; 4D #1,4; 4.4 Section Review omit ALL of question 3 (note the change)
Physics B and F: None
Physical Science: Complete Newton's 2nd Law of Motion problem sheet
Honors Physics reviewed their homework problem for normal force, net force and acceleration before pole-vaulting into friction. Static and kinetic friction were contrasted the the nature of the coefficient of friction was described. To work problems with friction, proper calculation of the normal force is required, which is why we spent additional time on that topic yesterday. We'll go over the work on Monday, have a brief discussion on air resistance and then begin the review process for Wednesday's exam.
Physics B and F took their Forces exam, but since F was long block, Physics F got to begin a lab on the Impulse-Momentum Theorem. We start discussing momentum in B Block on Monday and F Block will have time to complete their labs.
Physical Science reviewed their N-2 lab before reviewing their N-2 homework assignment from Wednesday. The lab nicely demonstrated that when applied force is held constant, increasing mass decreases acceleration and decreasing mass increases acceleration, in accordance with Newton's 2nd Law of Motion. Students then received a series of practice problems for N-2, which snuck in good things like unit conversions and calculations of acceleration. The answers to those problems are provided below, but we will go over them in class on Monday, as well.
- 2.76 x 10-3 m/s2
- -448 m/s2
- 0.400 m/s2
- -6.12 m/s2
- 0.37 kg
- 2.0 x 104kg
- 9.5 x 104kg
- a. 0.2 N b. 2 kg
- 2.06 x 104N
- -1.86 x 107N
- -3.6 x 105N
- 1.7 x 106N
- 9.4 m/s2
- 15 kg
- 3.16 N
- 0.532 m/s2
- a. 6.41 x 104kg b. 1.31 x 103
- a. -1.8 x 103m/s2; 180 g b. 1.3 x 105N
Homework
Honors Physics: 4C #2; 4D #1,4; 4.4 Section Review omit ALL of question 3 (note the change)
Physics B and F: None
Physical Science: Complete Newton's 2nd Law of Motion problem sheet
10/14/10
It's All About Newton
Honors Physics spent time working with the idea of weight and the normal force. The weight of an object varies with location, though mass remains constant. We'll get into the force of gravity a little later to see why this variation in weight occurs. We then turned attention to calculating normal force for objects on horizontal surfaces (where it is equal and opposite to the object's weight) and on inclines (where it is equal and opposite to the component of the object's weight that is perpendicular to the incline). We also investigated how external forces acting on an object, such as pushes and pulls affect the normal force. Your homework problem has you work through these ideas and here are the answers if you want to check your work:
We'll go over this problem tomorrow before using the ideas we've been working on to tackle friction.
Physics B and F reviewed for their forces and laws of motion exam. Catch me tomorrow before school if you have any additional questions.
Physical Science started class by going over their graphing assignment. A graph of force (dependent) vs. mass (independent) produced a very nice straight line, corresponding to the tenets of N-2. The slope of the line represented the mass of the object. Students then investigated Newton's 2nd Law of Motion with a lab activity. A constant force produced predictably diminishing accelerations as the mass of the object increased. N-2: acceleration is directly proportional to net force and inversely proportional to inertia (mass. We'll discuss the lab tomorrow and go over the N-2 homework questions/problems from yesterday.
Homework
Honors Physics: Complete normal force homework problem
Physics B and F: Prepare for exam
Physical Science: Complete lab write up
- 342 N
- 186 N
- 2.3 m/s2
We'll go over this problem tomorrow before using the ideas we've been working on to tackle friction.
Physics B and F reviewed for their forces and laws of motion exam. Catch me tomorrow before school if you have any additional questions.
Physical Science started class by going over their graphing assignment. A graph of force (dependent) vs. mass (independent) produced a very nice straight line, corresponding to the tenets of N-2. The slope of the line represented the mass of the object. Students then investigated Newton's 2nd Law of Motion with a lab activity. A constant force produced predictably diminishing accelerations as the mass of the object increased. N-2: acceleration is directly proportional to net force and inversely proportional to inertia (mass. We'll discuss the lab tomorrow and go over the N-2 homework questions/problems from yesterday.
Homework
Honors Physics: Complete normal force homework problem
Physics B and F: Prepare for exam
Physical Science: Complete lab write up
10/13/10
Wild Wednesday
Honors Physics spent the period kicking wooden blocks around on the floor to investigate kinetic friction. Actually, that was only a piece of the investigation, but it was the most entertaining to watch. Static and kinetic friction were both targeted in today's work. Static friction outclasses kinetic friction in terms of magnitude (given the same surfaces). You graphs demonstrated the force required to start the wood block moving was greater than the force required to keep the block moving at constant velocity. The peak force on your graph was indicative of the value for Fs,max, which must be overcome by an applied force for a object to be set in motion. Your value for Fk could be inferred from the graph segment indicating the block moving at constant velocity. Constant velocity indicates Fnet = 0, so the applied force is being matched by the force of kinetic friction. Adding mass to your system increased the force of friction by increasing the normal force the block experienced. Part 3 of your investigation allowed you to look at position-time and velocity-time graphs for motion where kinetic friction acted as the net force. The acceleration value from the velocity-time graph (which was a constant value) and the block's mass allowed you to calculate the magnitude of the frictional force using N-2. We' start discussion everyday forces like friction and weight tomorrow. The lab isn't due until Friday, but we'll address any questions about the investigation tomorrow.
Physics B reviewed their Air Resistance lab and used the lab to illustrate various topics discussed in the chapter. We took some extra time to go back over Newton's 3rd Law of Motion and students had some class time to begin working on their N-3 critical thinking questions. We'll go over these tomorrow before reviewing for Friday's exam.
Physics E shared answers for their N-3 critical thinking questions, then began the review process for Friday's exam. We went through the note packet, highlighting key topics and students are strongly encouraged to take some time tonight to go through the exam material and come with questions tomorrow to address in class.
Physical Science reviewed Newton's 1st Law of Motion and then tackled Newton's 2nd Law. Although many people view N-2 only as a formula F = ma or a = F/m, be very aware that N-2 actually says about the interaction of Fnet and inertia to determine an object's change in motion. We took time to work a couple of practice problems with the N-2 formula before beginning a graphing assignment for Newton's 2nd Law. Tomorrow, a lab investigation for N-2 is on the agenda.
Homework
Honors Physics: Lab write up due Friday
Physics B: p. 84-85 of the ancillary packet #19, 24, 25, 28, 29, 32, 36, 37
Physics F: Prepare for Friday's exam
Physical Science: Complete #33 on page 370 (due tomorrow) and the 11.1 Section Review (due Friday)
Physics B reviewed their Air Resistance lab and used the lab to illustrate various topics discussed in the chapter. We took some extra time to go back over Newton's 3rd Law of Motion and students had some class time to begin working on their N-3 critical thinking questions. We'll go over these tomorrow before reviewing for Friday's exam.
Physics E shared answers for their N-3 critical thinking questions, then began the review process for Friday's exam. We went through the note packet, highlighting key topics and students are strongly encouraged to take some time tonight to go through the exam material and come with questions tomorrow to address in class.
Physical Science reviewed Newton's 1st Law of Motion and then tackled Newton's 2nd Law. Although many people view N-2 only as a formula F = ma or a = F/m, be very aware that N-2 actually says about the interaction of Fnet and inertia to determine an object's change in motion. We took time to work a couple of practice problems with the N-2 formula before beginning a graphing assignment for Newton's 2nd Law. Tomorrow, a lab investigation for N-2 is on the agenda.
Homework
Honors Physics: Lab write up due Friday
Physics B: p. 84-85 of the ancillary packet #19, 24, 25, 28, 29, 32, 36, 37
Physics F: Prepare for Friday's exam
Physical Science: Complete #33 on page 370 (due tomorrow) and the 11.1 Section Review (due Friday)
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