Collision and conservation of momentum

a ______________- occurs when two objects hit each other

• momentum

• velocity

• collision

• vector

Which describes an elastic collision. check all that apply

• an egg smashes on the ground

• two marbles bounce off one another

• bumper cars bounce off each other at the park

• two trains collide and couple (attach)

an inelastic collision involves objects sticking together or

• bouncing off one another

• changing shape

• rolling away

• total kinetic energy remaining the same

A 2.5 kg bouncy ball is dropped and hits the floor with a velocity of -6m/s. It bounces back up with a velocity of +6m/s. What is the change in momentum of this ball

• +15 kg x m/s

• -15 kg x m/s

Which formula represents an inelastic collision?

• (m1v1) + (m2v2) = (m1 + m2) v3

• (m1v1) + (m2v2) = (m1v3) = (m2v4)

What is the momentum of a 75 kg fullback carrying a football at a velocity of 5m/s?

• 375 kg x m/s

• 15 kg x m/s

• 75 kg x m/s

• 25 kg x m/s

Mrs. L, a famous rodeo bull rider at 57 kg, is thrown from a bull. the 600 kg bull chases after her at 10 m/s. While running away at 2.5 m/s, Mrs. L jumps on the back of the bull to avoid being killed! How fast does the bull run with Mrs. L on its back!

• 10 kg x m/s

• 9.3 kg x m/s

• 8.4 kg x m/s

• 6.2 kg x m/s

James, a 70 kg snowboarder recklessly "flies" down the hill at 15 m/s. He approaches an uphill grade ahead. He grabs on to his 105 kg friend, Larry who is going 8 m/s. If they continue to hold hands, what will be their velocity?

• 15.2 kg x m/s

• 6.7 kg x m/s

• 9.5 kg x m/s

• 10.8 kg x m/s

two bumper cars collide and bounce off each other. The pink is 300kg, with its passenger, and is traveling at 2.5 m/s. The blue car is 275 kg, with its passenger, with a velocity of 2 m/s.

After they collide, the pink car's new velocity is 1 m/s. What is the new velocity of the blue car?

• 3.6 kg x m/s

• 1.7 kg x m/s

• 2.1 kg x m/s

• 3.3 kg x m/s