Understanding Forces and Motion

What is a force?

• A type of energy

• A push or pull

• A state of rest

• A type of motion

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

• Gravity

• Magnetism

• Friction

• Electric force

Explain why ice results in less friction compared to sandpaper.

• Ice is colder than sandpaper.

• Ice has a smoother surface than sandpaper.

• Ice is heavier than sandpaper.

• Ice is more colorful than sandpaper.

Which of the following best describes Newton's 1st Law of Motion?

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

• An object in motion will stay in motion until an outside force acts upon it.

• The greater the mass, the smaller the change in motion for a given force.

• The rate of change of velocity is acceleration.

If a car suddenly stops, why do passengers tend to lurch forward?

• Because of gravity

• Because of inertia

• Because of friction

• Because of acceleration

Which of the following scenarios best illustrates Newton's 3rd Law of Motion?

• A book resting on a table

• A rocket launching into space

• A ball rolling down a hill

• A car accelerating on a highway

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Calculate the force exerted by an object with a mass of 5 kg and an acceleration of 2 m/s² using Newton's 2nd Law.

• 5 N

• 10 N

• 15 N

• 20 N

Which of the following is a non-contact force?

• Friction

• Tension

• Gravity

• Normal force

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What might happen to a rock's acceleration as it tumbles down a hill?

• It will remain constant.

• It will decrease.

• It will increase.

• It will stop.

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Why is it important to consider both mass and force when analyzing an object's motion according to Newton's 2nd Law?

• Because mass and force are unrelated.

• Because mass determines the object's color.

• Because the object's change in motion depends on both mass and force.

• Because force is always greater than mass.

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