1,180-N crate is being pushed across a level floor at a constant speed by a force F of 390 N at an angle of 20.0 degrees below the horizontal. a. what is the coefficient of kinetic friction between the crate and the floor. b. if the 390-N force is instead pulling the block at an angle of 20.0 degrees above the horizontal. ( Assume that the coefficient of friction is the same as that found in part (a)

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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?”