Science: Newton's 3rd Law of Motion

What is Newton's 3rd Law of Motion?

• An object at rest stays at rest and an object in motion stays in motion unless acted on by an outside force.

• An object's acceleration depends on the mass of the object and the size and direction of the force acting on it.

• Every action has an equal and opposite reaction.

• There is no third law.

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When one object exerts a force upon a second object, the second object exerts an equal and opposite force upon the first object.

• True

• False

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What would happen if you were leaning against a tree with a force, but the tree did not push back with equal force?

• Nothing.

• The tree would push you forward.

• You would push the tree backwards.

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What are actions?

• What you do.

• The fact or process you take to achieve something.

• We never learned about this.

• Reactions.

What's a reaction?

• When an action is performed to get the effect of the situation.

• We never learned about this.

• An action.

• Something you get from doing something.

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What would be an action? What would be the reaction?

• Action: Your foot stepping on the ground. Reaction: Your foot push off the ground and going upward.

• Action: Your foot stepping on the ground. Reaction: You falling.

• Action: You applying no force. Reaction: Your foot push off the ground and going upward.

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What happens when a frog jumps off of one lily pad, to another.

• The lily pad stays still.

• The frog falls into the water.

• The lily pad pushes backwards.

• The lily pad goes forward.

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How come a rocket works better in space because the gases can be pushed backward more easily?

• Space does not have air particles to slow down the gases.

• Space has no gravity.

• Space defies the third law of motion.

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Which ride/game in an amusement park can be an example of Newton' s third law of motion?

• Roller coaster

• Ferris wheel

• Whack-a-mole

• Bumper cars

• Merry-go-round

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Why are bumper cars a good example of Newton' s third law of motion?

• When two cars hit, they both exert equal and opposite forces and slide backwards.

• Friction stops the cars.

• They need to accelerate to drive the car.

• If the cars crash, the people inside will fly out of the car without a seat belt.

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