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The work done by the centripetal force i...

The work done by the centripetal force in quarter revolution would be,

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Zero , because the centripetal force is always perpendicular to the direction of motion .
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A particle of mass m moves in a circle of radius R with a uniform speed v . (i) the angular speed of particle is v//R . (ii) the time period of revolution is 2piR//v . (iii) the acceleration of particle is v^(2)//R . (iv) the work done by the centripetal force in half revolution is (mv^(2)//R)xxpiR .

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A : When a body moves in a circle the work done by the centripetal force is always zero. R : Centripetal force is perpendicular to displacement at every instant.

Assertion : Work done by the centripetal force in moving a body along a circle is always zero. Reason : Because displacement of the body is along the force.

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Work done by frictional force

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MODERN PUBLICATION-WORK, ENERGY AND POWER -Revision Exercise (Very Short Answer Questions)
  1. A spring of spring constant k is cut in three equal pieces. The spring...

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  2. When is KE of a planet revolving around the sun maximum?

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  3. If K.E of a body is made three times , how will the momentum change...

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  4. If the momentum of a body is made three times , how will the kineti...

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  5. A bullet gets embedded in a wooden block. Where does its KE go?

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  6. One horse power is equal to

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  7. What is the power ? Write its dimensional formula .

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  8. How can you say that friction is a non - conservative force ?

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  9. The work done by the centripetal force in quarter revolution would be,

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  10. Can we change K.E of a system without changing its momentum ?

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  11. What will happen to potential energy of a spring when it is compresse...

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  12. What wil happen to potential energy of a spring when it is streched ...

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  13. What changes in uniform circular motion , momentm or K.E ?

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  14. What is an elastic collision ?

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  15. Inelastic collision is the-

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  16. Which physical quantity is conserved in both, elastic and inelastic co...

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  17. In which collision , the two bodies stick together after collision ?

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  18. COEFFICIENT OF RESTITUTION

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  19. The coefficient of restitution e for a perfectly elastic collision is

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  20. What is coefficient of restitution for a perfectly inelastic collis...

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