derive expressions for the static and kinetic coefficients of friction using any
ID: 1899919 • Letter: D
Question
derive expressions for the static and kinetic coefficients of friction using any terms relevant to the situation (e.g., applied force, normal force, acceleration of gravity, mass, angle of incline). .Block Pulled on Flat Surface
(a) Place a friction block fuzzy side down on a track and add some mass on top to give it extra traction. Pull the block VERY SLOWLY with a spring scale, starting with very little effort but continuously increasing your effort over a few seconds until the block suddenly slips, and then continuing for another second or two with the block sliding at constant speed.
Explanation / Answer
sliding down a ramp at constant speed means that Fp = Ff Fp = Fw sin(theta) Ff = mu(k) Fn Fn = Fw cos(theta) Ff = mu(k) Fw cos(theta) so mu(k) Fw cos(theta) = Fw sin(theta) cancel Fw and rearrange mu(k) = sin(theta) / cos(theta) = tan(theta)
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