Newton's Third Law and Universal Gravitation

Newton's Third Law of Motion states that forces

• always act in equal or opposite pairs

• equal mass times velocity

• act on an object to move it or to stop it.

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What are forces exerted by two objects on each other called?

• action-reaction force pairs

• gravity force pairs

• friction force pairs

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What direction does the ground push on you when you jump?

• The ground doesn't push on you.

• down

• up

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What direction must a boat crew move the oars to move the boat forward?

• forward and backward

• forward

• backward

If you push a skateboard with a force of 8 N and your mass is 80 kg, what is the force that the skateboard exerts on you?

• 75 N

• 8 N

• 7N

• 10 N

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A bus hits a bug and the bug splatters on the windshield, which force is greater?

• The Bus
• The Bug
• They're the same
• Gravity acting on the bus

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A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

• For every action there is an equal and opposite reaction.
• Every mass exerts a force on every other mass.
• An object at rest tends to stay at rest.
• Friction opposes the motion of an object.

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If a small compact car collides with a larger semi-truck. Which vehicle experiences more force?

• the car

• the truck

• neither, the forces are equal

• there is no correct answer here

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If a large semi truck collides with a smaller compact car, which vehicle experiences more acceleration?

• the semi

• the car

• neither, accelerations are equal

• there is no correct answer here

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When gravity pulls a skydiver towards the Earth, the reaction force is...

• The skydiver pulling the Earth.

• Air resistance

• The weight of the skydiver

• Drag

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