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Conceptual Physics | 12th Edition | ISBN: 9780321909107 | Authors: Paul G. Hewitt
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The sketch shows a coin at the edge of a turntable. The

Chapter 28, Problem 88TAE

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QUESTION:

The sketch shows a coin at the edge of a turntable. The weight of the coin

is shown by the vector \(W\). Two other forces act on the coin—the normal force and a force of friction that prevents it from sliding off the edge. Draw force vectors for both of these.

Equation Transcription:

Text Transcription:

W

Questions & Answers

QUESTION:

The sketch shows a coin at the edge of a turntable. The weight of the coin

is shown by the vector \(W\). Two other forces act on the coin—the normal force and a force of friction that prevents it from sliding off the edge. Draw force vectors for both of these.

Equation Transcription:

Text Transcription:

W

ANSWER:

Step 1 of 3

Vector '  ' is a vector that presents the force of gravity. That is the force with which a coin acts on a turntable. Since force didn't go through the turntable or broke it, and according to Newton's third law the turntable acts with the same force on a coin but in an opposite direction, that is what is called a normal force .

Force of friction  is between the turntable and the coin and without gravity it would not be possible. Formulation for force of friction is

Where  represents a constant which is defined by the materials of the two objects.

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