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Question
If action is always equal to reaction, explain why a cart pulled by a horse can be moved.
Solution
In a horse cart, the horse pushes the ground in backward direction. According to Newton’s third law of the motion, the ground pushes the horse in forward direction. Thus, the horse moves in the forward direction. As the cart is attached to the horse, the cart too moves in the forward direction.
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[Given: sin(35°) = 0.573, cos(35°) = 0.819, sin(110°) = 0.939, cos(110°) = –0.342]
