Force and Motion Review #2

If you stop your car suddenly, why would a computer on the seat fall onto the floor? (Think about Newton’s First Law.)

• Because of gravity

• Because of inertia

• Because of friction

• Because of acceleration

Which law of motion is F = ma?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Newton's Law of Gravitation

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Which law of motion does the balloon car show?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Newton's Law of Gravitation

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If 60 N of Force is used to move a 20 kg bag of rice, what will the acceleration be?

Use Newton’s 2nd Law.

• 2 m/s²

• 3 m/s²

• 80 m/s²

• 40 m/s²

When the air was pulled out, the ball and feather were “free falling.” They fell at the same speed because acceleration on earth due to ______ is always the same.

• Gravity

• Friction

• Magnetism

• Wind

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What depends on the amount of matter in an object?

• Mass

• Weight

• Neither

• Both

What changes because gravity changes (depending on where you are).

• Mass

• Weight

• Neither

• Both

You are holding a bag of potatoes for 10 minutes. Is work being done?

• Yes

• No

• Sometimes

• Maybe

You are pushing your bike (because it has a flat tire).

Is work being done?

• Yes

• No

• Sometimes

• Always

Is work being done? You are pulling on a door that doesn’t open.

• Yes

• No

• Sometimes

• Always