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A block of mass m is placed over a rogh ...

A block of mass m is placed over a rogh surface with coefficents of static and kinetic as `mu_(s) and mu _(k) .` A force F is applied to move block .Surface f is the force of fricty=tion between block and ound . Then chose the wrong opition (s).

A

`fle mu_(s)mg "till the block not move"`

B

`f=mu_(k)` mg when the block starts moving

C

`f=F` when block Is not moving

D

`fltF` when block is moving

Text Solution

Verified by Experts

The correct Answer is:
a,c,d
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