Question

When normal reaction is halved, the coefficient of friction is:

A. halved
B. unchanged
C. doubled
D. None

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Answer

When the normal reaction force is halved, the coefficient of friction remains:

B. unchanged

Explanation:

The coefficient of friction ($\mu$) is a measure that represents the ratio between the force of friction and the normal reaction force. This coefficient is solely dependent on the nature of the two surfaces in contact and is independent of the normal reaction force.

Learned from the given information, we can assert that the coefficient of friction ($\mu$) does not change when the normal reaction force is altered. Hence, if the normal reaction is halved, the coefficient of friction remains unchanged.

Therefore, the correct answer is B. unchanged.


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