Newton's third law

What do you know about Newton's third law? Take the quiz to learn about it.
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Questions #: 7
Time: 5 minutes
Pass Score: 80.0%
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Banana on a plate

Imagine a 2-pound banana resting on a plate. (That is a big banana!) The banana pushes downward on the plate with a force of 2 pounds.  Newton's third law tells us that the plate must therefore push upward on the banana with _____________

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Explanation

Newton's Third Law statement

When object X exerts a force on object Y,

then object (1) transparent exerts (2) transparent and opposite force on (3) transparent

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Y
an equal
a greater
a less
X
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Explanation

Banana on plate

 

A 2-pound banana resting on a plate as shown in the image.  Identify each force label

  • a = (1) transparent
  • b = (2) transparent
  • c = (3) transparent
  • d = (4) transparent
  • e = (5) transparent
drag and drop the selected option to the right place
The upward force of the plate on the banana
The downward force exerted by the banana on the plate
The force of gravity on the plate
The force exerted on the plate by the table or floor
The downward force of gravity on banana
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Explanation

Which two forces of the five indicated in the figure form the action-reaction pair of Newton's third law?

a = the downward force of the gravity on the banana

b = the upward force of the plate on the banana

c = the force of gravity on the plate

d = the downward force exerted by the banana on the plate

e = the force exerted upward on the plate by the table or floor

banana_on_plate.jpg

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Explanation

The tree limb

 

tree_limb_apple.jpg

In this figure, a tree limb exerts a 1-newton upward force on the apple (which weighs 1 newton). 

The apple exerts a

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Explanation

What object exerts the gravitational force on the apple?

The third law holds that for every force exerted by X on Y, there is an equal and opposite force exerted by Y on X.  if this is true, there must be a force equal and opposite to the apple's weight.  To see what this opposite force is, we must ask what object exerts the gravitational force on the apple?

tree_limb_apple.jpg

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Explanation

What if the apple falls?

What if the apple falls?  While it is falling, Newton's third law still applies.  the only force then actin on the apple is the force of 1($)

tree_limb_apple.jpg

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Explanation

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