InterviewSolution
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InterviewSolution
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Mark the correct statement(s).A. (a) Total work done by internal forces of a system on the system is always zero.B. (b) Total work done by internal forces of a system on the system is sometimes zero.C. (c) Total work done by internal forces acting between the particles of a rigid body is always zero.D. (d) Total work done by internal forces acting between the particles of a rigid body is sometimes zero. |
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Answer» Correct Answer - B::C Consider a system of two point particles which are free to move on a smooth horizontal surface, then the work done by electrical forces acting on the two parties is non-zero. But it is not necessarily true always. For a rigid body, there is no relative displacement of particles, hence, internal forces do not do any work. |
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