Conservation of Momentum: Physics in Motion Video

What does conservation mean in physics?

• Protecting something

• Something changes

• Something stays the same

• A change in momentum

True or false: Momentum can't be created or destroyed.

• True

• False

In a closed an isolated system, the momentum before a collision is:

• Less than the momentum after a collision

• More than the momentum after a collision

• The same as the momentum after a collision

When the two balls hit each other, what happened?

• The momentum of the first ball stayed the same

• All the momentum was transferred to the second ball

• The total amount of momentum changed

• Both the balls stopped

What two things do you have to multiply to find momentum?

• Force and time

• Force and velocity

• Mass and velocity

• Force and acceleration

Why is the total momentum after the collision the same?

• Because momentum is conserved

• Because momentum is created

• Because momentum is lost

• Because momentum is destroyed

What is the system in this example?

• The pool balls, the table, and the pool cue

• Only the first pool ball

• The two pool balls

• Only the second pool ball

What is the system in this case?

• The two people

• The whole roller skating rink

• Only the person on the left

• Only the person on the right

Why is the final momentum zero?

• Because the initial momentum was -10 N*s and momentum is not conserved

• Because the initial momentum was zero and momentum is conserved

• Because the initial momentum was 10 N*s and momentum is not conserved

• Because there is an outside force

If a value is negative, which way is it going?

• Left

• Right