Newton's 3rd Law of Motion

Forces come in ___________ ___________ force pairs.

• action, reaction

• acting lessons

• action, cut

• chemical reaction

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NGSS.MS-PS2-1

When a hammer exerts a force on the nail, the nail _________________________________________.

• exerts a smaller amount of force back onto the hammer

• exerts a larger amount of force back onto the hammer

• exerts the same amount of force back onto the hammer

• cries and cries and cries

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NGSS.MS-PS2-1

Newton's _____ Law of motion states that every action has an equal and opposite reaction.

• 1st

• 2nd

• 3rd

• 4th

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NGSS.MS-PS2-1

According to Newton's 3rd Law of Motion, for every ____________ there is an equal and opposite ___________________.

• action/reaction

• negative/positive

• action/protraction

• Martian/Earthling

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NGSS.MS-PS2-1

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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NGSS.MS-PS2-1

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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NGSS.MS-PS2-1

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 force greater than 5N

• Does nothing. A table has no force.

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NGSS.MS-PS2-1

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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NGSS.MS-PS2-1

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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NGSS.MS-PS2-1

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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NGSS.MS-PS2-1