Bob is pulling a box of his toys of mass 15.0 kg along a rough horizontal surface for a distance of 6.00 m. The tension force in the rope is 58.0 N and the angle is 30° with respect to the horizontal. The frictional force on the box is 18.0 N. Match the answers with questions. (Hint: Clearly draw the force vector and displacement vector for all cases.) What is the angle between the tension force vector and the displacement vector?                                                                                                         What is the angle between the friction force vector and the displacement vector?                                                                                                         What is the angle between the normal force vector and the displacement vector? A. 30° B. 150° C. 90° D. 60° E. none of the given F. 210° G. 0° H. 180°

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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?”