Honors Physics and Intro Physics are both working on forces in fluids, albeit at different levels of complexity. Intro Physics reviewed the basics of pressure, pressure with depth, buoyancy and density in preparation for tomorrow's exam. Honors Physics took on Bernoulli's equation, which is a statement of conservation of energy in fluid systems. Using Bernoulli's equation is like using a normal ol' conservation of energy statement - assess the physical reality of the problem (horizontal pipes, still fluids, systems open to the atmosphere at one or both ends, etc), then work the basic equation to fit the situation. The continuity equation sneaks in there, too so remember that Av = flow rate to help you out for some of the problems. We'll go over the homework in class tomorrow before embarking on a review for Monday's exam. The answers to your homework sheet:
Practice 9D
- 18 m/s, 1.7 x 10-3 m
- 11 m/s, 2.7 x 104 Pa
- 4.4 x 10-2 Pa decrease
Section Review
- 30 s
- 16 m/s, 1.72 x 105 Pa
- 2.7 m/s, 2.32 x 104 Pa
Physics A and B took on the nature of torque as the ability of a force to produce rotation. We examined how the size of the lever arm and angle of the applied force impacted the value for torque and discussed how to ascribe signs to the torque values to help calculate net torque. Tomorrow, A Block will review their work on torque and move on to simple machines. B Block will work on a lab focusing on centripetal force and hit simple machines on Monday, when A Block gets their lab period.
