Assignment 9 (Oct. 16)

Exam 2.  Be getting ready.  Work/Energy, Momentum (inelastic collisions), Friction and centripetal.  Next Tuesday

More quizzes due online (on Oct. 17). 

Note that I try to get quiz solutions posted quickly. If you don't see quiz8 solutions up quickly, tell me and I'll post it. 

After completing momentum, and gravitation we will be starting chs 10 and 11 on rotation.

Here is a good energy momentum problem.  Be able to do it.

A mass slides down a ramp from an initial height h above the level surface.  At the bottom of the frictionless ramp the mass(1) hits a second mass(2) and sticks to it.   The lump (stuck together) then slides on a surface with friction (having some coefficient of friction) until coming to rest.  No numbers here, express results in terms of masses, heights, g and coeff of friction.

a)    What is the speed of mass(1) at the bottom of the ramp (just before hitting mass2)?
b)    Now the collision occurs, what is the speed of the lump just after the collision (has not yet gone anywhere)?
c)    What is the KE of the system just before and just after the collision?
d)    After the collision, how far does the lump travel before coming to rest?