Air a. Draw the free body force diagram of the dangling mass (m₂), when you are holding the system at rest. Be sure to label your coordinate system, to set up Fnet ma in the next step. Cart on Pulley Experiment: F hand Air cart m₁ Pulley m₂ Mass b. Draw the free body force diagram of the air cart (m₁), in this same configuration where you are holding the system at rest. Again, label coordinate axes. c. Write the three equations of Newton's Second Law for the two masses (x-component, y- component for the air cart and one equation for dangling mass) with proper signs for directions. Be clear about which equation corresponds to which object, and which direction.

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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?”