Equal and Opposite Reaction

Newton's 3rd Law states that for every action, there will be an ________________________ but ______________________ reaction.

• equal, similar

• greater, similar

• equal, opposite

• greater, opposite

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A book pushes down on a table with a force of 5N, the table..

• Pushes back with a force of 5N

• Pushes back with a force less than 5N

• Pushes back with a forcec greater than 5N

• Does nothing. A table has no force.

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According to Newton’s Third Law, if someone jumps off a skateboard, the skateboard will roll backward because -

• the mass of the skateboard is the same as the mass of the person jumping off.

• the pull of gravity on the person is the same as on the skateboard, regardless of size.

• the air resistance on the person is great and the friction on the skateboard is small.

• for the force that sent the person forward, there is an equal force pushing back on the skateboard.

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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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A ball bat hits aball with a force of 100 Newtons. What is the force and direction exerted by the ball on the bat?

• 100 Newtons, same direction

• 100 Newtons, opposite direction

• 200 Newtons, same direction

• 200 Newtons, opposite direction

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According to Newton’s Third Law, when you lean on a wall, which force is greater?

• the wall's force

• your force

• the force of friction

• they are equal

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Which of Newton's Laws of Motion does this Newton's cradle demonstrate?

• Newton's 1st Law of Motion (interia)

• Newton's 2nd Law of Motion (F=m * a)

• Newton's 3rd Law of Motion (action-reaction)

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Which of the following is an example of Newton’s Third Law:

• You jump on a trampoline. It springs you back into the air.

• A swimmer pushes against a pool wall to begin swimming a lap.

• A rocket’s thrust pushes it out of Earth's atmosphere.

• All of the above

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Which is an example of 3rd Law?

• A ball rolling down a lane.

• A spinning top

• Flowing water

• Paper on a desk

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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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