# How Does The Roughness Of A Surface Affect The Coefficient Of Kinetic Friction For A Block Of Wood

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Discussion Questions: Answer the Testable Question. – How does the roughness of a surface affect the coefficient of static friction and the coefficient of kinetic friction for a block of wood, and how do these coefficients compare with each other?
From the ‘Results’ section above, as the roughness of a surface increases, the coefficients of friction for the block of wood increases. This can be concluded as the surfaces used in order of lowest roughness to highest roughness were the white surface, wooden surface and lastly the sandpaper surface had coefficients of friction increasing in the same order. For instance, to compare the static coefficients of the first trial of each surface in order of roughness, 0.20< 0.32. Therefore, corresponding with the coefficients of static friction, the coefficients of kinetic friction also increases as the roughness of the surface increases. In conclusion, from the data collected, the observation was that as the roughness of a surface increases, the coefficient of static friction and the coefficient of kinetic friction for a block of wood will increase.

In terms of the variables in this experiment, what type of relationship was being tested?

In this experiment, the relationship of the variable force of friction and the coefficient of static and coefficient of kinetic friction are being tested. From the formula:μk=(Ff,k)/Fn, and μs=(Ff,s max)/Fn, the coefficients of friction are equal to the force of friction divided by the normal