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Work done by a frictional force is...

Work done by a frictional force is

A

negative

B

positive

C

zero

D

all of the above

Text Solution

Verified by Experts

The correct Answer is:
D
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Work done by frictional force

A : Work done by the frictional force can’t be positive. R : Frictional force is a conservative force.

Assertion : Work done by the frictional force is negaive Reason : This is because frictional force acts along the dirction of motion

A trolley car starts from rest at the top of a hill as shown in figure -3.9 and moves down the curved track. Determine its speed as it reaches the bottom. Assume that the work done by frictional forces is negligible.

A block of mass 1 kg slides down a vertical curved track that is one quadrant of a circle of radius 1m. Its speed ast the the bottom si 2 m//s . The work done by frictional force is :

Find the work done by the frictional force in drawing a circle of radius r by a pencil of negligible mass with a normal pressing force N ( coefficient of friction mu_(k) ).

The work done by the frictional force on a surface in a drawing a circle of radius r on the surface by a pencil of negligible mass with a normal pressing force N ( coefficient of friction )is :

Assertion :- Work done is positive when force acts in the direction of displacement. Reason :- Work done by frictional force can not be positive.

ERRORLESS -FRICTION-MCQ S
  1. A heavy uniform chain lies on a horizontal table-top. If the coefficie...

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  2. The blocks A and B are arranged as shown in the figure. The pulley is ...

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  3. Work done by a frictional force is

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  4. L changes partly from a table which is kept in equilibrium by friction...

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  5. When two surfaces are coated with a lubricant, then they

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  6. A 20 kg block is initially at rest on a rough horizontal surface. A h...

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  7. A block A with mass 100kg is resting on another block B of mass 200kg....

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  8. To avoid slipping while walking on ice, one should take smaller steps ...

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  9. A box is lying on an inclined plane what is the coefficient of static ...

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  10. A block of mass 2kg is kept on the floor. The coefficient of static fr...

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  11. Which one of the following is not used to reduce friction

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  12. If a ladder weighting 250 N is placed against a smooth vertical wall h...

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  13. A body of mass 2 kg is kept by pressing to a vertical wall by a force ...

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

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

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  16. If mass of A=10 kg, coefficent of static friction =0.2 coefficient of ...

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  17. A uniform metal chain is placed on a rough table such that the one end...

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  18. A lift is moving down with an acceleration equal to the acceleration d...

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  19. If a ladder weighting 250 N is placed against a smooth vertical wall h...

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  20. Which one of the following statements is correct

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