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A book of 1kg is held against a wall by...

A book of 1kg is held against a wall by applying a perpendicular force F.
If `u_(s)=0.2` then what is the minimum value of F?

Text Solution

Verified by Experts

The situation is shown in fig. The forces acting on the book are For book to be a rest it is essential that Mg = `f_(s)`
But `f_(smax)=mu_(s)N " "and N=F`
`thereforeMg=mu_(s)FimpliesF=(Mg)/(mu_(s))=(1xx9.8)/(0.2)=49N`
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