2/ 18 Newton's 3rd Law review

When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?

• The cannon moving forward

• The cannon moving backwards

• The cannonball moving backwards

• The cannonball moving forward

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Action reaction forces never cancel each other out because

• They act on different objects.

• They act on the same objects

• They do not act on objects.

• They act in the same direction

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When a heavy football player and a light one run into each other, who exerts more force

• The light one

• The light one has the same force as the heavy one

• The heavy one

• it is impossible to determine

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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?

• 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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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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NGSS.MS-PS2-2

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 but in the same direction

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

• The net force is balanced

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When the person pushes on the wall, and the wall pushes back, why does the person move and not the wall?

• The wall has more mass

• The person is pushing harder than the wall

• The wall is pushing harder than the person

• The skateboard is pushing on the person

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When Ronda Rousey got kicked in the face, what are the action and reaction forces?

• The foot pushing on face and face pushing on foot

• Ronda Rousey and media criticism

• The foot pushing on the air and air on foot

• Ronda Rousey pushing on the floor and floor on Rhonda Rousey

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An archer pulls the bowstring back, then releases the string and the arrow flies forward. Pulling the string back is the...

• action force

• reaction force

• net force

• inertia

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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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