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 horizontal surface on the surface of the body is F, where
Mg≤f≤Mg√1+μ2
F=μMgF
F=Mg
Mg≥f≥Mg√1+μ2
A
Mg≤f≤Mg√1+μ2
B
Mg≥f≥Mg√1+μ2
C
F=μMgF
D
F=Mg
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Solution
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If R is normal reaction,
Maximum force by surface when friction work
F=√f2+R2=√μR2+R2(∵f=μR)
=R√μ2+1
Maximum force = R, when there is no friction.
Hence, ranging from R to R√μ2+1
we get Mg≤f≤mg√μ2+1
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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