A load devil like the one shown in Figure is used to move a 120 kg load with an acceleration of 1.2 m/s2. The angle with which the little devil is carried is 60 degrees from the horizontal. Suppose that between the little devil's tires and the ground there is a coefficient of friction of 0.1. What force should apply on the little devil? Free Body Diagram of Exercise Balance of forces in both axes Operations Results

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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?”