A chair of mass 12.0 kg is sitting on the horizontal floor which is not frictionless. You push on the chair with a force F=40.0N that is directed at and angle of 37.0 degree below the horizontal and the chair slides along the floor. Use your FBD in No. 2 and Newton’s Laws of Motion to calculate the Normal Force that the floor is exerts on the chair.

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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?”