Which of the following statements are true considering the forces on the system of you and a bicycle as you pedal the bike at a constant velocity in a horizontal straight line? a. All forces are in balance, with the net force equal to zero. b. The force you are exerting on the pedal is greater than the resisting forces. c. The resisting forces are greater than the force you are exerting. d. The resisting forces of air and tire friction are less than the force you are exerting.

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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?”