8th Grade Chapter 1 Lesson 3 Test Review

When you push a pole downward on Earth to make a pole vault, Earth exerts an equal force on the pole.

• true

• false

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If you push on a wall with a force of 30 N, the force acting on you from the wall is which of the following?

• 0 N

• 10 N

• 20 N

• 30 N

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The statement “for every action there is an equal and opposite reaction” is a statement of

• The law of conservation of momentum

• Newton’s first law of motion

• Newton’s second law of motion

• Newton’s third law of motion

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When a bug hits a windshield of a car, the force of the car on the bug equals the force of the bug on the car.

• true

• false

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Pick the best example of Newton’s third law of motion in action.

• A rocket accelerates in space due to gases and the rocket pushing each other in opposite directions.

• A rocket is towed to the launch pad while friction acts in the opposite direction.

• An asteroid moving around the sun while being pulled toward the sun.

• An asteroid continues to spin because nothing has exerted a force to stop it.

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Based on Newton’s third law of motion, when a person on a skateboard throws a heavy concrete block to the north, the person will be pushed to the

• North

• South

• East

• west

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If you throw a ball in the air, Earth exerts a force on the ball. The ball in the air exerts no force on the Earth

• true

• false

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Kelly sits on a rock in a field. Which of the following correctly names the force pairs?

• Kelly pushes on the rock, and the rock pushes on Earth.

• Earth pulls on Kelly, and Kelly pulls on Earth.

• The rock pushes on Earth and Earth pulls on the rock.

• Kelly pushes on the rock, and the rock pushes on Kelly.

Your friend stated that action and reaction force pairs do not change motion because they cancel one another out.

• true

• false

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Which of the following systems does NOT represent a force pair?

• When you push on a bike’s brakes, the friction between the tires and the road increases.

• When a driver jumps off a diving board, the board pushes the diver up.

• When an ice skater pushes off a wall, the wall pushes the skater off the wall.

• When a boy pulls a wagon, the wagon pulls back on the boy

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