14. What is a free-body diagram? a. It’s a sketch of a moving body that shows internal forces of the body and reaction forces b. It’s a sketch of an undisturbed body that shows external forces of the body c. It’s a sketch of an isolated body that shows external forces of the body and reaction forces d. It’s a sketch of a body in motion that shows bending forces of the body 15. The main condition for the rigid body is that the distance between various particles of the body does change. a. True b. False

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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?”