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If work done ...

Question

If work done by external & non-conservative internal forces is zero, then the mechanical energy of the system remains constant.

A

True

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B

False

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Solution

The correct option is A True

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Q. Which of the following is wrong? a) W(external force) =Change in mechanical energy,if workdone by non-conservative forces is zero b.W(Conservative )+W(non-conservative )+ W(external force) =change in kinetic energy c.-Change in potential energy=W(conservative) dMechanical energy of system remainsalways constant

Q. Work done by internal and external forces is equal to change in the kinetic energy of the system.

Q. The potential energy of a system increases if work is done(1) Upon the system by a conservative force(2) Upon the system by a non conservative force(3) By the system against a conservative force(4) By the system against a non conservative force

Q. If the net work done on a system or by the system is zero, then, its mechanical energy remains constant. State true or false.

Q. A non-conservative force is one that
I. Has differing work done depending on the path taken by the object
II. Converts mechanical energy into various forms of internal energy, typically with more chaotic forms of motion
III. Gives work done as zero as long as particles move along a circular path (i.e. a path with no overall displacement).

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