Newton's Third Law of Motion

The nozzle of a rocket is pointed downward so that as fuel is ignited, the exhaust pushes downward. Why is this arrangement necessary for a rocket to function properly?

• The rocket is protected from the heat of the exhaust

• Burned fuel can be collected on the ground

• As fuel is combusted, the rocket pushes the gases backward and the gases push the rocket forward

• This allows the rocket to be steered properly

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Newton's Third Law describes action and reaction forces. A table for four scenarios is provided. Which of the following scenarios in the table show equal and opposite reaction forces?

• The rocket and balloon

• The rocket and train

• The balloon and girl

• The train and girl

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Which best describes Action and Reaction forces?

• Action forces happen BEFORE Reaction forces

• They happen simultaneously (at the same exact time)

• Reaction forces happen first

• Happen at different times depending on the situation

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The head of a hammer is often made of steel. This makes the head heavy, which helps create a strong force for driving nails. Steel is also strong. The head of a hammer must be strong to resist what force?

• The force of the air resistance on the moving hammer

• The force of the person using the hammer

• The force of gravity pulling down on the hammer

• The force of the nail pushing in the opposite direction

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The swimmer pushes off of the wall of the pool and moves forward. What is the ACTION in this example?

• Swimmer pushes off the wall of the pool

• Swimmer moves forward

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A rocket pushes exhaust 10, 000 N. Without any other forces acting on the rocket, how much force does the rocket go forward?

• 15,000 N

• 1,000 N

• 10, 000 N

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Every action, there is an ____ but _____ reaction.

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Newton's Third Law States...

• for every reaction, there is an equal and opposite action

• for every action, there is an equal and opposite reaction

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What is another name for Newton's Third Law of Motion?

• Law of Inertia

• Law of Action-reaction forces

• Law of Forces and motion

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True or false: All forces act in pairs

• True

• False

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