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  • The total work done on a particle is equal to the change in its kinetic energyOption: 1 Always<div class='qna-optio

The total work done on a particle is equal to the change in its kinetic energy

Option: 1

Always


Option: 2

Only if the forces acting on the body are conservative


Option: 3

Only in an inertial frame


Option: 4

Only if no work is done by an external force

 


Answers (1)

best_answer

Choice (1) is correct because the work energy theorem states that the net work done on a particle is equal to the change in its kinetic energy. This means that whatever the nature of the force acting on the particle, the total work done on the particle is always equal to the change in its kinetic energy.

Choice (2) is incorrect because the work done by a nonconservative force, such as friction, is not expressed in terms of potential energy. However, as stated earlier, the work done by non-conservative forces can always be expressed as a change in the kinetic energy of the particle, which is always true.

Choice (3) is incorrect because the function theorem is valid in any frame, not just inertial frames.

The kinetic energy of a particle is a quantity that has nothing to do with the coordinate system, and the change in kinetic energy caused by working on the particle has nothing to do with the coordinate system.

Choice (4) is incorrect because the function theorem holds for both external and internal forces acting on particles. The total work done by all forces on a particle is equal to the change in its kinetic energy, whether the force is external or internal. However, if there are no external forces acting on the particle system, then in addition to conservation of energy, the total momentum of the system is also conserved.

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SANGALDEEP SINGH

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