Concept 1.3 Colliding Objects Review-8th Grade

1. A mother is pushing a stroller with one child in it. If she adds a second child of equal mass to a stroller, and pushes the stroller with the same force as before, the speed of the stroller would:

• Stay the same

• Double

• Be half as much

• Triple

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2. Two balls in a vacuum chamber are dropped simultaneously from different heights. Which characteristic will be the same for both the balls throughout their motion?

• speed

• velocity

• acceleration

• kinetic energy

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3. A car speeding on a racetrack begins to make a turn when it runs through a large amount of oil. According to Newton's third law, which statement best describes what happens to the car?

• The tires spin faster, which slows down the car.

• The car's tires continue to push against the road, but the road pushes on the tires with double the force, causing the car to spin.

• The oil reduces the friction between the tires and the road. This causes the car to move in a straight line off the track.

• The car's tires stop pushing on the road while the road continues to push against the tires, causing the car to slide.

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4. According to Newton's second law of motion, upon what two factors does the acceleration of an object depend?

• the velocity of the object and the amount of force applied on it

• the mass and weight of the object

• the mass of the object and the amount of force applied to it.

• the speed and direction that the object is moving.

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5. A ball is dropped in vacuum. Which characteristic will not change when the ball is falling?

• velocity

• distance

• kinetic energy

• acceleration

6. Mass is a measure of which of the following quantities?

• energy

• matter

• space

• motion

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7. Newton's third law of motion states that _______________.

• for every action, there is an equal and opposite reaction.

• an object at rest will stay at rest or an object in motion will stay in motion with a constant velocity.

• acceleration is directly proportional to the magnitude of the force acting on it and inversely proportional to the mass of the object.

• whenever an object is falling, gravity pulls it down.

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8. When one figure skater pushes on another, both skaters move in opposite directions. Which of Newton's laws of motion best explains why this occurs?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Newton's Fourth Law

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9. Which of the following would not be an action-reaction pair according to Newton's third law of motion?

• An oar pushes the water, and the water pushes the oar.

• A dog wags its tail, and the tail wags the dog.

• A missile pushes a gas, and the gas pushes the missile.

• A boy sits in a chair, and the floor pushes the boy.

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10. A toy car is moving in a straight line at a constant speed. What will happen to the car if a force is applied to it in the opposite direction of its motion?

• The car will continue to move in a straight line at a constant speed.

• The speed of the car will decrease.

• The car will turn.

• The speed of the car will increase

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