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Assertion : Work done by the force or against the force does not depend on path, then force is called conservative force.
Reason : All central forces which follows the inverse square law are conservative forces
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Important Questions on Work, Energy and Power
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Assertion : Potential energy is possible only in conservative force field.
Reason : Potential energy is a relative quantity but K.E. is an absolute quantity.
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Assertion : A body can have energy without having momentum.
Reason : A body can have momentum without having mechanical energy.
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Assertion : A truck and a car moving with the same kinetic energy are brought to rest by the application of breaks which provide equal retarding forces. Both come to rest in equal distance.
Reason : It is possible that the speed of a body is zero but velocity is not zero.
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Assertion : If work done by the force depends on path then force is said to be conservative.
Reason : All the conservative forces are central force.
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Assertion: Frictional forces are conservative forces.
Reason: Potential energy can be associated with frictional forces.
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Assertion: The change in kinetic energy of a particle is equal to the work done on it by the net force.
Reason: Change in kinetic energy of the particle is equal to the work done only in the case of a system of one particle.
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Assertion: When a force of displaces a body by , then work done by this force must be for every observer watching that body.
Reason: Work done on a body does not depend on the observer that is observing the body.
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Assertion: When spring is elongated work done by spring is negative but when it is compressed work done by spring is positive.
Reason: Work done by spring is path-dependent.
