Newton’s Third Law
A horse pulls a cart along a flat road. Consider the following four forces that arise in this situation.
(1) the force of the horse pulling on the cart (3) the force of the horse pushing on the road
(2) the force of the cart pulling on the horse (4) the force of the road pushing on the horse
13. Which two forces form an "action-reaction" pair that obeys Newton's third law?
A) 1 and 4
B) 1 and 3
C) 2 and 4
D) 3 and 4
E) 2 and 3
14. Suppose that the horse and cart have started from rest; and as time goes on, their speed increases in the same direction. Which one of the following conclusions is correct concerning the magnitudes of the forces mentioned above?
A) Force 1 exceeds force 2.
B) Force 2 is less than force 3.
C) Force 2 exceeds force 4.
D) Force 3 exceeds force 4.
E) Forces 1 and 2 cannot have equal magnitudes.
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13. D) 3 and 4
14. D) Force 3 exceeds force 4.
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