Newton's third law

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 _____________

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

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

The apple exerts a

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?

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($)