The fan is rotated so that it is at a 30° angle to the track as seen in figure 2. Draw a free body diagram of the fan cart, from the top, showing the force from the fan, the components of that force parallel and perpendicular to the track, and the force of friction. 30° Figure 2: Fan cart with fan turned at an angle. How would you calculate the force from the fan causing the cart to accelerate down the track when the fan is set at an angle?

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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?”