Physics 1A, Section 6 November 6, 2008.

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Presentation transcript:

Physics 1A, Section 6 November 6, 2008

Section Business Quiz 2 grades: Homework #6: Replace FP5 with QP23 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

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

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

Quiz Problem 38

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

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

Section Business Quiz 2 grades: Homework #6: Replace FP5 with QP23 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