1. Physics 2 – Jan 31, 2017
P3 Challenge– A 2.3 kg object traveling east with a velocity 4.0 m/s bounces off a wall and turns around, traveling at 3.0 m/s. Find the impulse given to this object.
Today’s Objective: Review
Assignment:
Study for test
Momentum Test (80 pt) is Thursday
Agenda
Extra Review Problems
Extra problems as needed.

2. Content overview Basic Momentum p=mv; a vector
Change of momentum in 1 and 2 dimensions / impulse
Newton’s 2nd law: p=Ft with F = net force during contact
Conservation of momentum in collisions in 1 and 2 dimensions
General inelastic m1v1 + m2v2 = m1v1 + m2v2
Completely inelastic
Elastic (Special elastic solution equations will be on test.)

3. Exit Slip - Assignment
Exit Slip-A chair is pulled out from a person just about to sit down. The 70 kg person falls 0.50 m to land on the hard floor. If the person is in contact with the floor for s (for the first bounce), what are the a) impulse and b) average force acting on the person during the collision? (Assume the person’s velocity when starting to fall is zero.)
What’s Due on Feb 2? (Pending assignments to complete.)
Study for test
Momentum Test on Thursday
What’s Next? (How to prepare for the next day)
Read 3.1 p about Thermal Energy