1. MOMENTUM (p)
is defined as the product of the mass and velocity -is based on Newton’s 2nd Law
F = m a
F = m Δv t
F t = m Δv
IMPULSE
MOMENTUM

2. CHARACTERISTICS OF A MOVING OBJECT
A moving object has both kinetic energy and momentum.
KE = ½ mass x velocity2
P = mass x velocity

3. Ex. Compare the KE and momentum of two objects with the following characteristics:
m1 = 60 kg v1 = 4 m/s m2 = 6 kg v2 = 40 m/s
Solving for momentum, p:
P1 = m1 v1 = (60 kg) (4 m/s) = 240 kg-m/s
P2 = m2v2 = (6 kg) (40 m/s) = 240 kg-m/s
Solving for KE:
KE1 = ½ m1 v1 2 = ½ (60 kg) (4 m/s)2 = 480 J
KE2 = ½ m2v2 2 = ½ (6 kg) (40 m/s)2 = 4800 J
Therefore object 2 has the same momentum but 10 times the KE of object 1

5. Both KE and momentum are conserved in an elastic collision.