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In Fig. 7.149 , coefficient of friction ...

In Fig. 7.149 , coefficient of friction between the block and the floor is `mu` . Force F that will move the block on the floor with a uniform speed is :

A

`( mu sin theta + cos theta ) mg`

B

`( mu sin theta - cos theta )` mg

C

`(mu "mg")/( cos theta - mu sin theta)`

D

`( mu mg )/(sin theta - mu cos theta )`

Text Solution

Verified by Experts

The correct Answer is:
D
For vertical equilibrium

As body moves with uniform velocity (a = 0)
F sin `theta = mu N = mu (F "cos" theta + "mg")`
Solving , `F = ( mu "mg")/(( "sin" theta - mu cos theta ))`
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GRB PUBLICATION-FRICTION AND CIRCULAR MOTION -OBJECTIVE QUESTIONS ( only one choice is correct )
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  2. A particle 'P' is moving on a circular path under the action of only o...

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  3. In Fig. 7.149 , coefficient of friction between the block and the floo...

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  4. In Q.48 , the block can be made to slide on the floor only if theta is...

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  5. To avoid slipping while walking on ice, one should take smaller steps ...

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  6. A block of mass M slides down a rough inclined surface of inclination ...

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  7. In Fig. 7.150 , coefficient of friction between m(2) and the horizonta...

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  8. In Fig . 7.151 , coefficient of kinetic friction between the 4 kg bloc...

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  9. A uniform rope of length l lies on a table . If the coefficient of fri...

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  10. Two balls of masses m(1) and m(2) are separated from each other by a p...

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  11. The coefficient of static friction, mu(s) between block A of mass 2 k...

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  12. The minimum force required to start pushing a body up a rough (frictio...

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  13. A bar of mass m(1) is placed on a plank of mass m(2) which rests on a ...

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  14. In the given Fig. 7.154 , two masses 2 kg each are attached to a strin...

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  15. A block lying on a long horizontal conveyer belt moving at a constant ...

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  16. A particle of weight W rests on a rough inclined plane which makes an ...

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  17. A cart of mass M has a block of mass m in contact with it as shown in ...

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  18. A block is placed on a rough floor and a horizontal force F is applie...

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  19. If the coefficient of friction between an insect and bowl is mu and th...

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  20. A block rests on a rough inclined plane making an angle of 30^(@) with...

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