Collisions Review

In science, when one object runs into another we call it a _____________.

• crash

• hit

• strike

• collision

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What is transferred at the instant the bat hits the ball?

• matter

• energy

• sound

• light

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What do we call the section of a car that absorbs energy in a collision?

• windshield

• bumper

• hood

• crumple zone

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What happens when Dr. Jeff's mom collides with Izzy?

• nothing

• Dr. Jeff's mom flies back

• Izzy flies back

• they both fly back

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When a hockey puck hits a plexiglass barrier some of the energy is converted into what?

• sound and heat

• sound and matter

• matter and heat

• sound only

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A collision occurs when ...

• two or more objects hit each other with a force.

• an object in motion stays in motion.

• when an object at rest stays at rest.

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Select all the examples of collisions.

• car crash

• baseball bat hitting a baseball

• your fingers pushing the keys on a keyboard

• a car running at a fast speed

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What is the law of conservation of momentum in collisions?

• Momentum is always conserved in an isolated system.

• Momentum is lost in every collision.

• Momentum is only conserved in elastic collisions.

• Momentum is only conserved in inelastic collisions.

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Which of the following is an example of an elastic collision?

• Two billiard balls hitting each other and bouncing off.

• A car crash where the cars crumple and stick together.

• A football being kicked and deforming.

• A piece of clay hitting the ground and sticking.

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In a perfectly inelastic collision, what happens to the kinetic energy?

• It is completely conserved.

• It is completely lost.

• It is partially converted to other forms of energy.

• It is doubled.

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