Compare the "total momentum before" of both carts or balls and "total momentum after" for the ELASTIC collisions #1, 2 and 3. What happened to the total momentum of both objects after the collisions?

• increased
• decreased
• remained the same

Compare the total kinetic energy of both carts/balls before and after the ELASTIC collisions. What happened to the total energy after the elastic collisions?

• increased
• decreased
• remained the same

Compare the "total momentum before" of both carts/balls and "total momentum after" for the PERFECTLY INELASTIC collisions. What happened to the total after those collisions?

• increased
• decreased
• remained the same

Compare the total kinetic energy of both carts before and after the PERFECTLY INELASTIC collisions. What happened to the total ENERGY after those collisions?

• increased
• decreased
• remained the same

What do you notice about the change in momentum of each individual object in ALL collisions? Compare the red cart to the blue cart or the blue ball to the pink ball.

• change in momentum of the more massive object is always a smaller and they are the same sign
• each object always has the same change in momentum but one of them is negative
• change in momentum of the more massive object is always larger and they are the same sign
• there is no pattern to the change in momentum
• the change in momentum for each is always a different number and they are the same sign

Answer explanation

If you look at each collision, the change each has is always the same number but one is negative.

What is one difference between elastic and perfectly inelastic collisions?

• perfectly inelastic bounce and elastic stick together
• elastic bounce and perfectly inelastic stick together
• there is no difference between how the collisions happen

What is another difference between elastic and perfectly inelastic collisions?

• Elastic collisions always have less total momentum after, inelastic always have the same total momentum

• Elastic collisions always have the same total energy before and after, inelastic collisions have less energy after

• Elastic collisions always have less total energy after, inelastic collisions always have the same total energy before and after

In Perfectly Inelastic collision #1, how does the final velocity of the blue ball compare to the initial velocity of the blue ball?

• the final velocity is the same as the initial velocity
• the final velocity is half of the initial velocity
• the final velocity is double the initial velocity
• the final velocity is quadruple the initial velocity

In both of the explosions, what is the total initial momentum of both objects?

• 0

• 9.9

• 3.3

• 10

• 5

In both of the explosions, what is the total final momentum of both objects?

• 0

• 9.9

• 3.3

• 10

• 5