A 400-gram package lying on a horizontal surface is attached to a horizontal string that passes over a smooth pulley. When a mass of 200 grams is attached to the other end of the string, the package is on the point of moving. Find , the coefficient of friction.
please explain it as well! i'm a 9th grader, and thank you :)
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Answer:
M1*g = 0.4 * 9.8 = 3.92 N. = Wt. of pkg
Explanation:
M1*g = 0.4 * 9.8 = 3.92 N. = Wt. of pkg.= Normal force(Fn).
Fp = 3.92*sin 0 = 0 = Force parallel to the surface.
= M2*g = 0.2 * 9.8 = 1.96 N. = Force applied.
Fs = us*Fn. = 3.92us.
&-Fp-Fs = M*a.
1.96-0-3.92us = M*0 = 0, us = 0.50.
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