Dave pushes his four-year-old son Thomas across the snow on a sled. As Dave pushes, Thomas speeds up. Which statement is true?A. The force of Dave on Thomas is larger than the force of Thomas on Dave.B. The force of Thomas on Dave is larger than the force of Dave on Thomas.C. Both forces have the same magnitude.D. It depends on how hard Dave pushes on Thomas.

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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?”