The value of μk is
Correct answer: B. Less than μs
- A. Equal to μs
- B. Less than μs
- C. Less and equal to μs
- D. Greater than μs
Explanation
The coefficient of kinetic friction (μk) is generally less than the coefficient of static friction (μs) because it usually requires more force to overcome static friction and start motion than to maintain motion against kinetic friction. Option A is incorrect because μk is not equal to μs; they represent different states of motion. Option C suggests an incorrect expression; it cannot be 'less and equal' at the same time. Option D is incorrect because it is easier to keep an object moving (kinetic friction) than to start it moving (static friction).
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