Chapter 2: Forces and Motion

London kicks a soccer ball across a grassy field. What force causes the ball to eventually roll to a stop?

• Gravity

• Friction

• Inertia

• Air resistance

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What is Newton’s first law of motion?

• Force is the product of mass and inertia.

• A moving object will speed up unless a force acts on it.

• A moving object will slow down unless a force acts on it.

• An object does not change its state of motion unless a force acts on it.

Mrs. Sabel is pushing a wheelbarrow in her garden. If she continues to push with the same force, which of the following will cause the wheelbarrow to accelerate more slowly?

• Greasing the wheel of the wheelbarrow

• Moving the wheelbarrow onto a paved sidewalk

• Adding a pile of dirt to the wheelbarrow

• Holding the handles of the wheelbarrow with gloves

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Which of the following is a contact force?

• Electricity

• Air resistance

• Gravity

• Magnetism

Which of the following would cause an acceleration?

• A decrease in mass

• An increase in force

• A decrease in force

• All of the other answer choices

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In a game of tug-of-war, what happens when the forces exerted by team A are greater than the forces of team B?

• Only Team A will start to move.

• Only Team B will start to move.

• Both teams will start moving.

• Both teams will remain in the same place.

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A car runs out of gas while moving forward on a flat, straight road. The car keeps rolling for a while because

• it has inertia.

• friction does not affect it.

• it has increasing acceleration.

• gravity pulls it forward.

Which of the following is not an example of accelerated motion?

• An elevator speeding up

• An elevator slowing down

• A car driving at constant speed

• A car driving around a curve at constant speed

Harmonica is mowing her lawn and the lawnmower is moving forward. Which of the following statements must be true?

• There are no forces acting on the lawnmower.

• The only force acting on the lawnmower is gravity.

• Tom is applying a force on the lawnmower.

• The total force on the lawnmower is zero.

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Which graph shows an object moving at a constant speed and then stopping?

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