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A student pulls a wooden box along a rou...

A student pulls a wooden box along a rough horizontal floor( without the block loosing contact with the floor) at constant speed by means of a force P as shown to the right. (W is weights of block, N is normal reaction on the block, f is force of friction on the block). which of the following must be true?

A

`Pgtf` and `NltW`

B

`Pgtf` and `N=W`

C

`P=f` and `NgtW`

D

`Pltf` and `N=W`

Text Solution

Verified by Experts

The correct Answer is:
A
The F.B.D of block is as shown
`N=W-P sin theta` , NltW
Because acceleration is zero
`P cos theta=f` or `P=f/(cos theta)`
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