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Question: For each of the situations given, state


For each of the situations given, state whether frictional forces do positive, negative, or zero work on the italicized object.
(a) A plate slides across a table and is brought to rest by friction.
(b) A person pushes a chair at constant speed across a rough, horizontal surface.
(c) A box is set down on a stationary conveyor belt. The conveyor belt is then turned on and the box begins to move, being carried along by the belt.
(d) A person exerts a horizontal force on a banana at rest on a counter top. The banana remains at rest.

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