Which one of the following about different frictional forces is correct?
Answer
The correct answer is C: Static friction > Kinetic friction > Rolling friction. For a given pair of surfaces and normal force, the limiting static friction is greater than the kinetic (sliding) friction, because once an object starts moving the microscopic interlocking is reduced. Rolling friction, where a body rolls without sliding, is much smaller…
A.Kinetic friction > Static friction > Rolling friction
B.Static friction > Rolling friction > Kinetic friction
C.Static friction > Kinetic friction > Rolling friction✓ Correct
D.Static friction > Kinetic friction = Rolling friction
Explanation
For a given pair of surfaces and normal force, the limiting static friction is greater than the kinetic (sliding) friction, because once an object starts moving the microscopic interlocking is reduced. Rolling friction, where a body rolls without sliding, is much smaller than kinetic friction because deformation, not sliding, is the main resistance. Therefore the correct order is Static friction > Kinetic friction > Rolling friction.
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