Physics
WAEC 2010
Which of the following statements about static friction is correct? It
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A.
is independent of the nature of the surface in contact
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B.
depends on the area of surface in contact
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C.
depends on the relative motion between the surface in contact
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D.
depends on the weight of the moving body
Correct Answer: Option D
Explanation
The maximum force of static friction (\(f_{s}\)) is directly proportional to the normal reaction force (\(R\)) pressing the two surfaces together (\(f_s = \mu_s R\)). On a flat, horizontal surface, the normal reaction force is exactly equal to the weight of the body (\(R = mg\)). Therefore, static friction depends directly on the body's weight.
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