Newton's 3rd Law

Newton’s law states that for every action, there is an ________ reaction.

• unequal and opposite

• equal and similar

• stronger and opposite

• equal and opposite

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NGSS.MS-PS2-1

Force always comes in________

• waves

• triplets

• pairs

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The two paired forces in Newton's third law:

• act on different objects

• are equal in size

• are opposite in direction

• are the same type

• all of the above

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NGSS.MS-PS2-1

When the person pushes the ground with their foot, the equal and opposite reaction force is

• the ground pushing back on their foot

• when they start to move forward

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NGSS.MS-PS2-1

During a rocket launch, 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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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?

• The backward motion of the boat is the reaction to the action of the person stepping onto the dock.

• The mass of the person 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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When a person pushes against the ground with their foot, the equal and opposite reaction force is

• when they start to move forward

• the ground pushing back on their foot

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What is the action in the picture?

• The man pushing against the wall

• The wall pushing back at the man

• The ground pushing against the man's foot

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If the person is pushing backwards with the paddle, why do they move forward?

• The person will actually move backwards, they need to paddle the other way

• The water pushes back with an equal and opposite force

• The person is pushing harder than the water

• The water pushes back with a greater force than the person

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If a person pushes down on a trampoline, why do they move back up into the air?

• The trampoline pushes back with a greater force than the person

• The trampoline pushes back with less force than the person

• The trampoline pushes back with an equal and opposite force as the person

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