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Physics 1A, Section 6

Physics 1A, Section 6. November 6, 2008. Section Business. Quiz 2 grades: mean = 16.1 / 20 median = 16.5 / 20 Homework #6: Replace FP5 with QP23 Quiz 3 will cover: reading through T.M.U. chapter 11 lectures/sections through today (Nov. 6) New material includes:

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Physics 1A, Section 6

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  1. Physics 1A, Section 6 November 6, 2008

  2. Section Business • Quiz 2 grades: • mean = 16.1 / 20 • median = 16.5 / 20 • Homework #6: Replace FP5 with QP23 • Quiz 3 will cover: • reading through T.M.U. chapter 11 • lectures/sections through today (Nov. 6) • New material includes: • conservation of momentum and energy • non-inertial frames

  3. Reading/Lecture Review • T.M.U. chapters 10-11 + lectures: • potential energy U and kinetic energy K • translational kinetic energy: K = ½ mv2 • uniform gravity: U = mgh • Newtonian gravity: U = -GmM/r • spring: U = ½ kd2 • nonconservative forces: friction, air resistance • Fx = -dU/dx; stable and unstable equilibrium • work: W = energy input = ∫F•ds • power = dW/dt = F•v • momentum p = mv • center of mass: rcm = S miri / S mi • systems of particles • impulsive forces and collision problems

  4. Crash Course in Collision Problems • Assume collision happens in an instant. • Describe “before” and “after” cases, nearly simultaneous. • During collision, ignore relatively weak external forces, compared to strong impulsive forces. • Momentum is conserved: • mjvj = constant • Kinetic energy: • elastic: 1/2 mjvj2 = constant • (partially) inelastic: 1/2 mjvj2 decreases • completely inelastic: objects stick to each other

  5. Quiz Problem 38

  6. Quiz Problem 38 • Answer: • v0 = sqrt[2g(h-2a)] • before ball collision: M upward, m downward • v1 = v0 (3M-m)/(M+m) = 2v0 • height = 4h – 3a

  7. Monday, November 10: • Final Problem 19 (collision + oscillatory motion) • Quiz Problem 53 (oscillatory motion) • Optional, but helpful, to look at these in advance.

  8. Section Business • Quiz 2 grades: • mean = 16.1 / 20 • median = 16.5 / 20 • Homework #6: Replace FP5 with QP23 • Quiz 3 will cover: • reading through T.M.U. chapter 11 • lectures/sections through today (Nov. 6) • New material includes: • conservation of momentum and energy • non-inertial frames

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