The forces, F 1, F2, and F3 act on an object of mass m = 6.5 kg as shown below. a) Calculate the magnitude and direction of the net force acting on the particle. b) Calculate the particle’s acceleration. c) What should be the magnitude and direction of the fourth force such that the object remains in equilibrium?

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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?”