Laws Of Motion Question 151

Question: A body of mass M is kept on a rough horizontal surface (friction coefficient μ ). A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on the body is F , where

Options:

A) F=mg

B) F=μMgf

C) MgFMg1+μ2

D) MgF≥=μMg1+μ2

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Maximum force by surface when friction works f2+R2=(μR)2+R2=Rμ2+1 Minimum force = R when there in no friction Hence, ranging from R to Rμ2+1 we get, mgFmgμ2+1



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