Draw a Free Body Diagram, write 2nd law equations and find the tension. Where does the WEIGHT act for purposes of calculation? Is the rod in STATIC EQUILIBRIUM? Explain It it moves describe the motion. At what point along the road is the string attached?

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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?”