Honors Physics reviewed their projectile problems and were given time to brainstorm solutions for those they had missed. Remember that if you get stuck while working, check the worked-out solutions provided on the course website. Sometimes just a little help with one step open the rest of the problem right up.
Physics B began their review for Wednesday's exam. We walked through the chapter highlighting the relevant test material and specifying which math skills will be required to handle the test problems. Students were give a review packet to work through and class time will be allotted tomorrow to continue that work or to get individual help with chapter topics.
Physics F concluded the chapter with a discussion of satellite motion. Satellites are just fancy projectiles - they move 2-dimensionally, with acceleration provided only by gravity. The descriptors of projectiles that we've been discussing all chapter long apply to satellites in the same way they'd apply to a kicked football. We also took time to examine the chapter to highlight the material relevant for the exam and the math skills that will need to be demonstrated. A review packet was distributed and students will have class time tomorrow to work on it and get individual help with remaining issues with the material.
Physical Science built on Friday's discussion of acceleration and practice acceleration problems by reviewing problem-solving techniques and examining how the MCAS formula sheet presents the acceleration formula. Students were then given a packet of problems that require they demonstrate their ability to use the acceleration formula and snuck in some of those pesky metric conversions, too. The solutions to the problems are presented below and we'll review these problems in class tomorrow before taking a look at adding acceleration to our motion graphs.
Acceleration Worksheet Solutions
- 44 m/s
- 10.4 m/s
- 49.8 km/hr
- 39.5 s
- 3.89 s
- 51 s
- 3.71 m/s2
- -21 m/s2
- 0.1 m/s2
- 44 m/s
- 120 s or 2 min
- 4.5 s
- 12.5 m/s
- 47.6 s
- 4.3 s
- -490 m/s2
- 3 m/s
- -1.0 x 10-6cm/y2
General problem solving hints:
- Read the problem completely through before starting work.
- Choose the most likely formula to solve for desired variable - it should ask for information that you're given in the problem.
- Write the formula down on paper.
- Read through the problem again and label the information that's presented (initial velocity, time, displacement, etc.)
- Using the formula as a template, match the labeled information to its location in the formula and write the filled- in version of the formula on your paper.
- Perform the necessary algebra to isolate the variable for which you're trying to solve.
- Check that the unit you get matches the unit for your desired answer.
- Check that the answers matches the general pattern you'd predict for situation given in the problem (solving for the velocity of a walking elephant should not yield 500 m/s, for instance).
Good luck!
Homework
Honors Physics: None
Physics B and F: Complete exam review material by Wednesday
Physical Science: Complete acceleration worksheet
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