Unit 2 - Energy: Lesson 2

What happens when two objects collide?

• Energy is changed into force.

• Energy is transferred from one object to another.

• Energy is created and the objects move faster.

• Energy is destroyed and the objects move slower.

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Which of the following collisions would cause a still object to move at the speed of the object that hit it?

• a collision of a moving object with a lighter still object

• a collision of a moving object with a heavier still object

• a collision of a moving object with a still object of the same weight

• a collision of a large, light object and a still object that is smaller, heavier

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When two objects of the same weight traveling at different speeds collide head on, both objects

• stop moving.

• change direction and move at a slower speed.

• change direction and move at their original speed.

• bounce backward and travel at the original speed of the other object.

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Some of the energy transferred during a collision can produce _________.

• heat

• light

• sound

• all of the above

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While playing with toy cars, Kirsten and Luca each push a car toward the center of the room. What happens when the toy cars collide, as shown in the photograph below?

• Energy is lost.

• Energy is gained.

• Energy is unchanged.

• Energy is transferred.

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In the image below, Tati is about to kick the football. Which of the following BEST explains how Tati can tell that energy transfers from his foot to the ball during the collision?

• The ball does not move.

• The speed of the ball changes.

• The weight of the ball changes.

• The weight and speed of the ball change.

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While playing soccer after school, Graciela (on the left) and Henry (on the right) both kick the ball at the same time. Graciela kicks the ball harder than Henry kicks the ball. Look at the bottom diagram. What happens to Henry’s ball? Use evidence in the diagram.

• It does not return to Henry.

• It returns to Henry at the same speed

• It returns to Henry at a faster speed.

• It returns to Henry at a slower speed.

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When a heavier object collides with a lighter object, the lighter object

• completely stops.

• moves faster.

• moves at the same speed.

• moves slower.

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What happens when two objects that weigh the same collide at the same speed?

• The objects will stop moving at the collision.

• The objects will return slower than they were traveling

• The objects will return faster than they were traveling

• The objects will return at the same speed they were traveling.

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NGSS.MS-PS2-1

If you kick an object quickly towards another object of equal weight moving slowly, the ball you kicked would

• return slowly.

• return quickly.

• roll forward.

• return at the speed at which it was kicked.

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