Does the coefficient of kinetic friction depend on speed? Explain, using your ex

Question

Does the coefficient of kinetic friction depend on speed? Explain, using your experimental data.

In my lab I calculated the acceleration of a wooden block stopping after being pushed (data below) with a motion detector. The coefficient of kinetic friction I calculated is much greater than the one I got with just pulling the block. The information I have found online so far says it should not affect it but my data says otherwise.

Calculation:

mass of block: .289kg

111.4/(.289*9.8)=mk

mk = 43.8 <---- is this correct?

Does the coefficient of kinetic friction depend on speed? Explain, using your experimental data. In my lab I calculated the acceleration of a wooden block stopping after being pushed (data below) with a motion detector. The coefficient of kinetic friction I calculated is much greater than the one I got with just pulling the block. The information I have found online so far says it should not affect it but my data says otherwise. Calculation: mass of block: .289kg f = Fn * mk 111.4/(.289*9.8)=mk mk = 43.8

Explanation / Answer

For a given temperature the coefficient of friction between any given pair of materials is constant. As temperature rises, different materials respond differently. Some may liquefy, in which case they may hydroplane on a thin film of low viscosity liquid. Others, like rubber, may soften and make better contact with higher friction.

Increased speed will raise the temperature, so the friction will change. But initially, the speed doesn't matter.

Ideally, the coefficient of kinetic friction only depends on the nature of the surfaces. It does not depend on any other factors, including the relative speed of the surfaces and the surface area of contact. You will determine

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