Friction

A

Does not affect the efficiency of a machine

B

Increases the efficiency of a machine

C

Decreases the efficiency of a machine

D

Northing can be said about the effect of friction on efficiency of a machine

Text Solution

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The correct Answer is:
C

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NARAYNA-LAW OF MOTION-EXERCISE - IV
  1. A 100 kg block is suspended with the help of three strings A, B and C....

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  2. A frictionless inclined plane of length l having inclination theta is ...

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  3. Friction

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  4. A box is placed on an inclined plane and has to be pushed down.The ang...

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  5. Figure shows two block A and B pushed against the wall with the force ...

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  6. If mu(k) is the coefficient of kinetic friction and mu(s) the coeffici...

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  7. A block of mass m is placed on a rough floor of a lift . The coeffi...

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  8. When a horse pulls a wagon, the force that causes the horse to move fo...

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

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  10. A body of mass m slides down a rough plane of inclination alpha . If m...

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  11. A particle is moving along a circular path. The angular velocity, line...

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  12. The angular acceleration of a particle moving along a circular path wi...

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  13. A bike of mass 200 kg (with rider) is running on the road with constan...

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  14. At t = 0 and u = 0, an object begins to be uniformly accelerated by a ...

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  15. Two bodies of 5 kg and 4 kg are tied to a string as shown in the figur...

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  16. An unloaded car moving with velocity u on a road can be stopped in a d...

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  17. The masses of 10kig and 20kg respectively are connected by a massless ...

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  18. A car going at a speed of 6m/s when it encounters a 15m slope of angl...

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  19. A block of mass m is placed on another block of mass M which itself is...

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  20. Block A of mass 5 kg is resting on a frictionless floor. Another block...

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