You are playing with your daughter in the snow. She sits on a sled and asks you to slide her across a flat, horizontal field. Which would be the easiest for you? Your answer: O pushing her from behind, by applying a force downward on her shoulders at 30° below the horizontal O attaching a rope to the front of the sled and pulling with a force at 30Ű above the horizontal both will be equally easy it depends on your daughter's mass.

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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?”