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To keep a particle moving with constant ...

To keep a particle moving with constant velocity on a frictionless surface, an external force

A

Should act continuously

B

Should be a variable force

C

not necessary

D

Should act opposite to the direction of motion

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The correct Answer is:
C
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AAKASH SERIES-LAWS OF MOTION-EXERCISE - I
  1. The limiting friction between two surfaces depends

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  2. A block 'B' rests on 'A'. A rests on a horizontal surface 'C' which is...

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  3. To keep a particle moving with constant velocity on a frictionless sur...

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  4. Frictional force between two bodies

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  5. If man is walking, direction of friction is

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  6. While walking on ice one should take small steps to avoid slipping. Th...

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  7. Car tyres are made of rubber and not of iron because

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  8. Aeroplanes are streamlined to reduce

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  9. It is easier to pull a lawn roller than to push it because pulling

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  10. A uniform rope of length L lies on a table. If the coefficient of fric...

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  11. In case of pulling & pushing minimum forces required are (w sin alpha)...

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  12. A body is moving in a circular orbit. It is just about to slide to the...

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  13. Figure showns two blocks P & Q kept in contact with the wall with the ...

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  14. A body is just supported at the face of a cart moving at an accelerati...

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  15. A wooden block sliding down from the top of a smooth inclined plane st...

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  16. The angle which the rough inclined plane makes with the horizontal whe...

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  17. When the angle of inclination of on inclined plane is theta, an object...

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  18. In a situation the contact force by a rough horizontal surface on a bo...

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  19. A scooter starting from rest moves with a constant acceleration for a ...

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  20. A body of mass M is kept on a rough horizontal surface (friction coeff...

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