When two objects are in contact with no relative motion, which of the following statements about the frictional force between them is true? a. The frictional force is always equal to µsn. b. The frictional force is always less than µsn. c. The frictional force is equal to µkn. d. The frictional force is either equal to or less µsn.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”