Force and Motion Review: Part 1

A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is most responsible for causing the wagon to stop?

• gravity acting on the wagon
• the mass of the wagon
• friction acting on the wagon
• the mass of the child

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Which best describes the force of gravity?

• a pushing force
• a pulling force
• a change in mass
• a change in speed

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Four different students take turns pushing a large, heavy ball on the school parking lot. What is the best way to determine which student used the most force to push the ball?

• compare the sizes of the students
• compare the ages of the students
• compare the distances that the ball rolled
• compare the number of times the ball was rolled

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Two identical balls are pushed with the same force. One ball is pushed along a flat surface and the other ball is pushed down a slanted surface. Which ball will travel faster and why?

• the ball on the flat surface, because of increased friction
• the ball on the flat surface, because of decreased gravity
• the ball on the slanted surface, because of increased gravity
• the ball on the slanted surface, because of decreased friction

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The gravitational force of the Sun is strong enough to hold all the planets of our solar system in orbit many millions of miles away. Which best describes why objects having far less mass on the surface of these planets are not pulled off and into the Sun?

• The objects have too little mass to be affected by the Sun.
• The objects have more mass on the planets than on the Sun.
• The objects are held by the greater combined gravity of all the planets.
• The objects are more strongly affected by the gravity of the planet on which they are found.

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What keeps the Moon orbiting Earth?

• the Sun’s gravity
• the Moon’s rotation
• Earth’s rotation
• Earth’s gravity

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Which is the best example of a pushing force that reduces the speed of an object?

• a bat hitting a baseball
• a brake rubbing against a wheel
• a pedal turning the wheels of a bicycle
• a skateboard wheel rolling against pavement

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NGSS.MS-PS2-2

Which investigation will best test the effects of gravity on moving objects?

• pencils falling from the same height

• balloons floating upward from the same height

• a bicycle speeding up on a flat surface

• a ball slowing down on a flat surface

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Which best describes the role friction plays in the operation of a car?

• Friction makes a car go faster.

• Friction keeps a car from stopping.

• Friction turns the car in a new direction.

• Friction helps a car slow down and stop.

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Carey left a bowling ball and kickball outside on a windy day. Which best explains why the kickball moved but the bowling ball did not?

• The kickball has less mass so it was easier to move.

• The force of gravity acting on the bowling ball is greater.

• The mass of the kickball is greater so it is easier to move.

• The force of gravity acting on the kickball is greater.

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