Motion & Force Review

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

• An object in motion will eventually stop due to friction.

• An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.

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

• Force equals mass times acceleration.

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NGSS.MS-PS2-2

Explain how friction affects the motion of a sliding object.

• Friction increases the speed of the object.

• Friction decreases the speed of the object.

• Friction has no effect on the object.

• Friction changes the direction of the object.

A 10 kg object is subject to a net force of 50 N. What is the acceleration of the object? A = F/M

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NGSS.MS-PS2-2

Describe a situation where Newton's Second Law is applied.

• A person sitting in a chair.

• A car accelerating when the gas pedal is pressed.

• A book lying on a table.

• A pendulum swinging back and forth.

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NGSS.MS-PS2-2

A bat is swung forward with 48 N of force at a baseball. What would be the reaction force?

• 48 N of force backward

• -48 N of force forward

• 48 N forward

• There is no reaction force.

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NGSS.MS-PS2-1

How does increasing the mass of an object affect its acceleration if the same force is applied?

• Acceleration increases.

• Acceleration decreases.

• Acceleration remains the same.

• Acceleration becomes zero.

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NGSS.MS-PS2-2

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NGSS.MS-PS2-2

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

• The object remains at rest.

• The object moves at a constant speed.

• The object accelerates.

• The object decelerates.

Tags

NGSS.MS-PS2-2

Which of the following is an example of friction affecting motion?

• A ball rolling and coming to a stop

• A ball floating in water.

• A bird flying in the sky.

• A leaf falling from a tree.