When traveling on an airplane you get meals on a serving tray that has large coefficients of static and kinetic friction between the tray and dishes on it. Assume the airplane is moving from left to right. Assume also that the tray is parallel to the velocity of the airplane. d. Draw a force diagram for a cup on a serving tray as seen by a stationary observer on Earth if the airplane is on a runway and speeding up; the cup is at rest on the tray.

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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?”