Conservation of Momentum. The physics version of Before and After…. Law of Conservation of Momentum. In the absence of net external force , the total momentum of a system remains constant . . total initial momentum = total final momentum
The physics version of
Before and After…
In the absence of net external force, the total momentum of a system remains constant.
total initial momentum = total final momentum
Rewrite the equation above using mass and velocity
Thinking through the collisions:
Put all of these in a picture or diagram
momentum is conserved
kinetic energy is not conserved
Collide and stick!
momentum and kinetic energy are conserved
Collide and bounce!
Start as one unit and break apart
A cue ball with a mass of 1kg moves at 2 m/s towards the 8-ball (same mass). The 8 ball is initially at rest. The balls collide elastically. If the cue ball continues moving in the same direction at 0.2 m/s, what is the velocity of the 8-ball after the collision?
A 12 kg cart moving east at 5 m/s collides head on and sticks to a 16 kg cart headed west at 7 m/s. Calculate the velocity of the 2 cart system after the collision.
You mistakenly slide out to the middle of a frozen lake. Fortunately you get to your feet on the surface. In a fit of anger you throw your shoe south at 12m/s. What is your recoil velocity? (Your mass is 60 kg and your shoe’s mass is 1 kg)