Which of the following statements about friction is not true? *       A. An object of large mass is pulled down onto a surface with a greater force than an object of low mass and, as a consequence, experiences a greater friction       B. The direction of friction is always opposite to the direction of motion       C. Friction is a force       D. The direction of friction is always the same as the direction of motion

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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?”