Consider two peoplepushing a toboggan with four children on it up a snowcovered slope. Construct a problem in which you calculatethe acceleration of the toboggan and its load. Include a freebody diagram of the appropriate system of interest as thebasis for your analysis. Show vector forces and theircomponents and explain the choice of coordinates. Amongthe things to be considered are the forces exerted by thosepushing, the angle of the slope, and the masses of thetoboggan and children.

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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?”