![]() ![]() A vertical force can never cause a horizontal displacement thus, a vertical force does not do work on a horizontally displaced object!! Regardless of the magnitude of the force and displacement, F*d*cosine 90 degrees is 0 (since the cosine of 90 degrees is 0). If the work done by the waiter on the tray were to be calculated, then the results would be 0. As such, the angle between the force and the displacement is 90 degrees. The force supplied by the waiter on the tray is an upward force and the displacement of the tray is a horizontal displacement. It was mentioned earlier that the waiter does not do work upon the tray as he carries it across the room. Scenario C involves a situation similar to the waiter who carried a tray full of meals above his head by one arm straight across the room at constant speed. Let's consider Scenario C above in more detail. To Do Work, Forces Must Cause Displacements Thus, the angle between F and d is 90 degrees. In such an instance, the force vector and the displacement vector are at right angles to each other.
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