Do Now
1. Describe what happens during collisions A & B.
2. Label collisions A & B as elastic or inelastic.
A
B
Homework :D
Physics to Go 3-6
2.
Quiz 3-6
Due
TODAY!
1.
 Quiz 3-3 & 3-4 Corrections
Monday
February 29th
Tuesday
March 1st
Objectives 3-6
We are learning…
 In all collisions, the total momentum
before the collision is equal to the total
momentum after the collision. This law
of conservation of momentum is true of
collisions from planets to microscopic
particles
1.What laws of physics are
BIG Question
used
traffic-accident
We will
be by
successful
when we can…
investigators
tothe
reconstruct
 Understand
and apply
law of
conservation
of momentum to collisions
an accident?
 Measure the momentum before and after
a moving mass strikes a stationary mass
in a head-on collision
Agenda
• Do Now 5
• Physics Talk 15
• Practice 20
• Checking Up 5
Elastic vs. Inelastic
Conservation of p
Problem 1: A boy and girl are riding in go karts at an
amusement park. A 75 kg boy and car are moving at 3
m/s toward a 50 kg girl and car who are moving toward
him at 1.8 m/s. If they catch up, stick together, and then
move away together, what is their final velocity?
Conservation of p
Problem 2: A steel ball with a mass of 2 kg is traveling
at 3 m/s. It collides with a stationary ball that has a mass
of 1 kg. Upon collision, the smaller ball moves at 4m/s.
What is the velocity of the larger ball?
Checking Up 3-6