Newton's Laws

A push or a pull is called a

• Gravity

• Force

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What is Newton's 2nd Law?

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

• Acceleration depends on two variables, the mass of the object and the amount of force.

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What is Newton's 3rd Law?

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

• Acceleration depends on two variables, the mass of the object and the amount of force.

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What explains why objects resist changes in their state of motion?

• gravity

• inertia

• force

• friction

Looking at the image. Decide if this is balanced or unbalanced.

• Unbalanced

• Balanced

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Looking at the image. Decide if this is balanced or unbalanced.

• Unbalanced

• Balanced

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The girl on the sled will remain in motion unless

• her motion is changed by magnetic forces.

• she is stopped by an outside force.

• she accelerates at a constant speed.

• the force of friction forcer her to move faster.

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"A body at rest tends to remain at rest, and a body in motion, tends to remain in motion, unless acted upon by an unbalanced force."

This is describing the law of

• forces

• inertia

• velocity

• gravity

The picture shows a spinning water sprinkler.

Water comes through the hose and is sprayed by the sprinkler.

Which principle best explains why the sprinkler spins?

• Energy is released when water condenses.

• Most substances expand when heated and contract when cooled.

• Every action has an equal and opposite reaction.

• Solid substances are usually more dense than liquid.

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The picture shows a weightlifter holding the barbell over his head.

The force of gravity pulling down on the barbell is 756 newtons.

How many newtons of force are exerted by the weightlifter to hold the barbell up?

• No Newtons

• 756 Newtons

• 368 Newtons

• 14767 Newtons

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