Forces and Motion Quiz

What is the force that opposes motion between two surfaces in contact?

• friction

• inertia

• gravity

• magnetism

A force has both strength and ___________.

• balance

• direction

• color

• light

What is the force that pulls objects downward towards the center of the Earth?

• magnetism

• gravity

• friction

• electricity

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What happens to an object when the forces acting on it are balanced?

• The object accelerates in the direction of the net force.

• The object comes to a stop.

• The object changes direction randomly.

• The object remains at rest or continues to move at a constant velocity.

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What happens to an object when the forces acting on it are unbalanced?

• The object remains at rest.

• The object may change its speed, or it may change its direction.

• The object continues to move at a constant velocity.

• The object moves in a circular path.

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Which of the following is an example of an unbalanced force?

• Pushing a car with a flat tire to make it move forward

• Moving a car on a trailer from one place to another

• Sitting in a car while it is stationary in the parking lot

• Leaving a car parked on a flat surface

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Which of the following is an example of a balanced force?

• A rope moving farther to one side during a game of tug-o-war

• A soccer ball being kicked across the field

• A book sitting still on the table

• • Two players in an arm-wrestling game applying different amounts of force

If two identical dump trucks are driving down the road carrying different amounts of scraps, which one will be able to slow down faster if they begin to brake at the same time and both apply the same amount of force to do so?

• The truck with more mass will slow down faster.

• The truck with less mass will slow down faster.

• Both trucks will slow down at the same speed.

• The trucks will not be able to slow down until they empty their loads.

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What must happen in order for an object to experience a change in motion?

Select TWO.

• Gravity must not act on the object.

• Unbalanced forces must act on the object.

• Balanced forces must act on the object.

• The object's force must overcome the force of friction.

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If you exert the same gentle force on a basketball and a golf ball, which would be true?

• The basketball would accelerate faster but travel a shorter distance.

• The golf ball would accelerate faster but travel a shorter distance.

• The basketball would accelerate faster and travel farther.

• The golf ball would accelerate faster and travel farther.

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