Question

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measurements of of friction are very sensitive to the conditions of the.
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Explanation:

Friction has different types like static and kinetic. The coefficient of friction ($\mu$) quantifies the frictional force between two surfaces. The value of the coefficient of friction depends on the nature of the surfaces in contact. For example, a rough surface (like sandpaper - surface) will have a higher coefficient of friction compared to a smooth surface (like ice - surface) when in contact with the same object.

Answer:

coefficient; surfaces