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A block of mass 1 kg is held at rest aga...

A block of mass 1 kg is held at rest against a rough vertical surface by pushing by a force F horizontally. The coefficient of friction is `0.5.` When

A

(a)F = 40 N, friction on the block is 20 N.

B

(b)F = 30 N, friction on the block is 10 N.

C

(c)F = 20 N, friction on the block is 10 N.

D

(d)Minimum value of force F to keep block at rest is 20 N.

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The correct Answer is:
B, C, D
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ALLEN -NEWTON'S LAWS OF MOTION & FRICTION-EXERCISE (O-1)
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  2. A system is pushed by a force F as shown in figure All surfaces are sm...

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  4. A block of mass 1 kg is held at rest against a rough vertical surface ...

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  5. A block is kept on a rough horizontal surface as shown. Its mass is 2 ...

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  9. A uniform rope of mass (m) and length (L) placed on frictionless horiz...

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  10. A uniform rope of mass (m) and length (L) placed on frictionless horiz...

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  11. A uniform rope of mass (m) and length (L) placed on frictionless horiz...

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  12. The figure shown blocks A and B are mass 2 kg and 8 kg and they are co...

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  13. The figure shown blocks A and B are mass 2 kg and 8 kg and they are co...

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  14. The figure shown blocks A and B are mass 2 kg and 8 kg and they are co...

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  15. The blocks are on frictionless inclined ramp and connected by a massle...

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  16. The blocks are on frictionless inclined ramp and connected by a massle...

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  17. The blocks are on frictionless inclined ramp and connected by a massle...

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  18. In the diamram shown in figure , match the following (g=10m//s^(2))

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  19. Match the situations in column I to the accelerations of blocks in the...

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  20. A sphere of mass 10 kg is placed in equibriu in a V shaped groove plan...

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