Phy53 Lect Dr. brown 28 Sep 2010
examples -- center of mass for continuous distribution
1. quarter circle "coat hanger"
2. non-uniform linear density bar of length L
momentum
conservation of momentum
examples
1. skaters push each other
2. moving skater runs into stationary skater
Impulse = area under F(t)
Average force = \frac{impulse}{\Delta t}
example
gun shoots N bb's per unit time at plate with spring so average force can be measured
Collisions -- inelastic and elastic
using center of mass reference frame
example
bullet hits block and slides along rough surface a distance D
introduces K = \frac{p^2}{2m}