Which of the following statements describes the relationship between rolling friction and static friction?
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A.
Rolling friction is slightly greater than static friction
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B.
Rolling friction is always equal to static friction
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C.
Rolling friction is much smaller than static friction
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D.
Rolling friction is much greater than static friction
Correct Answer:
C. Rolling friction is much smaller than static friction
Explanation:
Rolling friction is significantly weaker than static friction because it occurs when an object rolls over a surface, involving much less surface contact and fewer interlocking irregularities compared to when an object is at rest. Static friction must be overcome to initiate motion from a stationary position, making it the strongest type of frictional force, followed by sliding friction, and finally rolling friction. This hierarchy exists because rolling reduces the resistance caused by the deformation of surfaces and the time atoms have to bond at the points of contact.
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