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Choose the correct statement out of the following.

A

Work done by the static friction on a body will always be positive

B

Work done by the kinetic friction on a body will always be negative

C

Work done by the static friction on a bady will always be zero

D

Work done by the static friction on a body may either be positive, negative or zero

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The correct Answer is:
B
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AAKASH INSTITUTE-TEST 2-EXERCISE
  1. Two blocks A and B having masses 5 kg and 10 kg respectively connected...

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  2. A uniform rod of mass m and length l is hinged at upper end. Rod is fr...

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  3. A particle of mass 2 kg released from point A(2, 0, 0) m as shown in t...

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  4. The radius of gyration of a uniform square plate of mass M and side a ...

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  5. Choose the correct statement about the center mass of a body,

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  6. Block A of mass 3 kg is placed on another block B of mass 5 kg placed ...

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  7. The potential energy of a particle varies with position X according to...

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  8. A man pulls out a block of mass m from the depth d with help of a ligh...

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  9. A wooden block of mass 2m is hung with the help of a light string of l...

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  10. A ball collides perpendicularly with a vertical wall with speed v1 and...

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  11. A constant force F acts on a body The power delivered by F will depend...

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  12. The potential energy of a particle of mass 2 kg moving in a plane is g...

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  13. Choose the correct statement out of the following.

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  14. A force bar F = (3 hati-4 hatj +b hat k)N is acting on the particle w...

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  15. A block of mass 10 kg is released from top of rough inclined plane as ...

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  16. A force F = (x hat i+2y hat j)N is applied on an object of mass 10 kg,...

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  17. An arrangement is shown in figure. If all the surfaces are smooth and ...

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  18. A block of mass 10 kg is placed on the rough horizontal surface. A pul...

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  19. A rope of length 5 m has uniform mass per unit length. lambda = 2 kg/m...

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  20. Choose the correct statement(s) about the frictional force between two...

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