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A block of mass 1 kg is pushed against a...

A block of mass 1 kg is pushed against a rough vertical wall of `mu=0.1`

For F = 150, 50 or 100 N the force of friction on the blocks is respectively :

A

10 N ,5 N , 10 N

B

15 N ,5 N , 10 N

C

10 N ,10 N , 10 N

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
a
F=N `rarr` mg `le N mu` to avoid sliding i.s `f ge mg//mu` ie `f ge 100 N` to avoid sliding if there is no sliding f=mg
i.e if `f ge 100 N` force offriction =mg & for `f lt 100` N sliding occurs and kinetic friction acts `rarr f=muN=muF`
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