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The ratio of mu(k) (kinetic friction) an...

The ratio of `mu_(k)` (kinetic friction) and `mu_(s)` (state friction) is

A

greater than 1

B

less than 1

C

equal to 1

D

depends on condition

Text Solution

Verified by Experts

The correct Answer is:
b
less than 1
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A block of mass M is sliding down the plane. Coefficient of static friction is mu_(s) and kinetic friction is mu_(k) . Then friction force acting on the block is :

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A block of mass m rests on a rough horizontal plane having coefficient of kinetic friction mu_(k) and coefficient of static friction mu_(s) . The spring is in its natural, when a constant force of magnitude P=(5mu_(k)mg)/(4) starts acting on the block. The spring force F is a function of extension x as F=kx^(2).( Where k is spring constant ) (a) Comment on the relation between mu_(s) and mu_(k) for the motion to start. (b) Find the maximum extension in the spring ( Assume the force P is sufficient make the block move ) .

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Coefficient of kinetic friction and coefficient of static friction between two blocks is mu_(k) and mu_(s) respectively. In general

In the Fig. shown a time dependent force F expressed as F=kt is applied on a block of mass 5 kg. Coefficient of static and kinetic friction is mu_(s)=0.4 and mu_(k)=0.3 . Motion begins when t=2 sec draw a acceleration vs time graph for block. (m=5 kg, mu_(s)=0.4, mu_(k)=0.3)

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CENGAGE PHYSICS-FRICTION-MANDATORY EXERCISE. (EXERCISE SET I)
  1. A body of mass 100 g is made just to slide on a rough surface by apply...

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  2. A weight 'W' rests on a horizontal plane. What will be the least force...

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  3. A horizontal force of 10 N is necessary to just hold a block stationar...

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  4. A mass of 4 kg rests on a horizontal plane. When the plane is graduall...

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  5. The ratio of mu(k) (kinetic friction) and mu(s) (state friction) is

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  6. What is the relation between the normal reaction acting on a surface a...

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  7. A block of mass 0.1 kg is held against a wall by applying a horizontal...

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  8. The block of mass m is in contact with a moving cart as shown in the f...

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  9. A block is placed on an inclined plane. The angle of inclination of th...

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  10. Find the maximum value of force F such that the block shown in the fig...

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  11. If F denotes the contact force, f denotes the frictional force exerted...

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  12. In the figure, blocks A and B weigh 20 N and 100 N respectively. The b...

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  13. A rocket is fired vertically from the earth with an acceleration of 2g...

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  14. A horizontal force of 10N is necessary to just hold a block stationary...

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  15. The acceleration of a moving body down a rough inclined plane is

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  16. A body of mass Mis kept on a rough horizontal surface with friction co...

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  17. A block of mass m is placed at rest on a horizontal rough surface with...

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  18. A block rests on a rough inclined plane making an angle of 30° with th...

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  19. A force is linearly increasing with time, on a block of mass m placed ...

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  20. In the figure shown, the frictional coefficient between the table and ...

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