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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

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.

(a)

To determine
Whether the frictional force does positive, negative or zero work on a plate slides across a table and is brought to rest by friction.

Explanation

Since the displacement of the plate and the frictional force are in the opposite direction th...

b)

To determine
Whether the frictional force does positive, negative or zero work when a person pushes a chair at constant speed across a rough, horizontal surface.

c)

To determine
Whether the frictional force does positive, negative or zero work when a box is set down on a stationary conveyor belt and the conveyor belt is turned on and the box begins to move.

d)

To determine
Whether the frictional force does positive, negative or zero work when a person exerts a horizontal force on a banana at rest on a counter top and the banana remains at rest.

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