Answer the following briefly. `(` Answer should not be of more than one or two line `)`
`(i)` Can friction coeffiecient be greater than unity ?
`(ii)` Why is friction force Nonconservation force ?
`(iii)` Can frictio do positive work ?
`(iv)` Is earth an inertial frace ?
`(v)` Greater force is required to make the body move than to keep it moving, hence we can say that static friction is always greater than kinetic friction. Comment on it.
`(vi)` Lesser force is required to pull a lawn than to push it. Why ?

Answer

`(i)` yes `(ii)` depend supon with `(iii)` yes `(iv)` no `(v)` limiting friction needs to be overcome to make body move
`(vi) N ` is larger

Explanation

`(i)` yes
`(ii)` depends upon path
`(iii)` yes
`(iv)` no
`(v)` limiting friction needs to be overcome to make body move
`(vi)` tension increases
`(vii) N` is larger