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```				   Ques) A block of mass m  is paled at rest on a horizontal rough surface with the angle of friction @. The block is pulled with a force F at an angle theta with the horizontal.Show that the mmin value of F required to move the block is [mgsin@ ] / cos( theta - @).
```

7 years ago

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```
here represent theta by x
frictional coeff. = tan @
on balancing forces :
in X-dirn :                             F cosx = f
where f = N.tan@
in Y-dirn.:                          Fsinx + N = mg
on solving, we get
F(cosx - tan@.sinx ) = mg.tan@
F = mg.sin@ / cos(x - @ )
---
Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best.

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IIT Kgp - 2005 batch
```
7 years ago

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