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# Physics help please!?

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If you put a 1 kg book on a table and it doesn't slide until you raise the table 33 degrees, what is μs, the coefficient of static (stationary) friction?

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- billrussell42Lv 72 months agoFavorite Answer
If you put a 1 kg book on a table and it doesn't slide until you raise the table 33 degrees, what is μs, the coefficient of static (stationary) friction?

at 33º, the force normal to the surface is mg cos 33

and friction is mgµ cos 33

force parallel to the surface is mg sin 33

set them equal

mgµ cos 33 = mg sin 33

µ = sin 33/cos 33 = tan 33 = 0.649

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- Anonymous2 months ago
μs = tan 33° = 0.65

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