Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts a force of 67.0 N, the second a force of 94.0 N, friction is 20.0 N, and the mass of the third child plus wagon is 23.0 kg.   a. Calculate the acceleration in m/s2. (Enter the magnitude.) b. What would the acceleration be (in m/s2) if friction were 27.0 N? (Enter the magnitude.)

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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?”