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A certain tray has total mass (tray + added weights) or 0.500 kg. It is attached...

A certain tray has total mass (tray + added weights) or 0.500 kg. It is attached to a string which is run over a pulley and then attached to a hanger and weights. When the hanger and weights have a total mass of 50 grams or more, they descend (fall downwards), otherwise they remain stationary. What is the coefficient of static friction for the tray?

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Answer #1

at 50 gm , there is no movement

so T = mg = 0.05*9.8 = 0.49 N

T = uMg

0.49 = u*0.5*9.8

u = 0.1

so the coefficient of friction is 0.1

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