A chain consists of identical links, each with a mass of 2.5 kg. You grab the top link and pull the chain so that it accelerates upwards at a constant rate of 2.5 m/s2.               a)  Draw a free body diagram of the bottom three links (labeled 1, 2, 3). Label all forces and use double subscript notation to denote which object exerts the force and which object is experiencing the force.             b)  Find the magnitude of the force exerted on link 1 by link 2, in Newtons.             c)  Find the magnitude of the force exerted on link 2 by link 3, in Newtons.

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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?”