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Is work done by a non conservative force...

Is work done by a non conservative force always negative ? Comment.

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No. For example, work done by a non conservative force like friction is zero, so long as the body does not start moving. Again when friction causes motion, work done by friction is positive.
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Can work done by a non - conservative force be positive ?

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STATEMENT-1: Work-energy theorem is consequence of Newton's laws of motion. STATEMENT-2: The work done by a conservative force along a closed path is zero. STATEMENT3: Work done by a constant force is independent of the path.

Assertion:The work done by a conservative force such as gravity depends on the initial and final positions only Reason: The work done by a force can not be calculated if the exact nature of the force is not known.

Shown that work done by a conservative force on a particle moving between two points is path independent.

Friction is non-conservative force. How ?

Work done by the conservative force on a system is equal to :

Statement-1:Comets move around the sun in elliptical orbits, the gravitational force on the comet due to sun is not normal to the comet's velocity, but the work done by the gravitational force over every complete orbit of the comet is zero. Statement-2: Gravitational force is a conservative force and the work done by a conservative force over a closed path is always zero.

PRADEEP-WORK, ENERGY AND POWER-Very Short Anwer Question.
  1. Does K.E. depend upon the direction of motion involved ? Can it be ne...

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  2. Name the largest and smallest practical unit of energy.

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  3. Is work done by a non conservative force always negative ? Comment.

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  4. Does potential energy of a spring decrease // increase when it is comp...

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  5. When an air bubble rises in water, what happens to its potential energ...

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  6. Name the process in which momentum changes but KE does not.

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  7. A shot fired from a cannon explodes in air. What will be the changes i...

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  8. The momentum of an object is doubled. How does its K.E. change?

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  9. Can P.E. of an object be negative?

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  10. Does the work done in moving a body depend on how fast or how slow the...

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  11. A spring is cut into two equal halves. How is the spring constant of e...

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  12. Is it possible exert a force which does work on a body without changin...

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  13. In case of a moving body as force of friction is mumg, can we regard m...

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  14. A ball of mass m moving with vel. V strikes head on elastically with a...

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  15. Is it possible to have a collision in which the whole of KE is lost?

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  16. If two objects collide and one is initially at rest (a) is it possible...

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  17. In which, elastic or inelastic collision, the momentum is conserved ? ...

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  18. Which physical quantities are conserved in an elastic collision?

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

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  20. If two bodies stick together after collision. Will the collision be el...

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