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Question Number 24685 by Tinkutara last updated on 24/Nov/17

The sum of the kinetic and potential  energies of a system of objects is conserved  (1) Only when no external force acts on  the objects  (2) Only when the objects move along  closed paths  (3) Only when the work done by the  resultant external force is zero  (4) None of these

$$\mathrm{The}\:\mathrm{sum}\:\mathrm{of}\:\mathrm{the}\:\mathrm{kinetic}\:\mathrm{and}\:\mathrm{potential} \\ $$$$\mathrm{energies}\:\mathrm{of}\:\mathrm{a}\:\mathrm{system}\:\mathrm{of}\:\mathrm{objects}\:\mathrm{is}\:\mathrm{conserved} \\ $$$$\left(\mathrm{1}\right)\:\mathrm{Only}\:\mathrm{when}\:\mathrm{no}\:\mathrm{external}\:\mathrm{force}\:\mathrm{acts}\:\mathrm{on} \\ $$$$\mathrm{the}\:\mathrm{objects} \\ $$$$\left(\mathrm{2}\right)\:\mathrm{Only}\:\mathrm{when}\:\mathrm{the}\:\mathrm{objects}\:\mathrm{move}\:\mathrm{along} \\ $$$$\mathrm{closed}\:\mathrm{paths} \\ $$$$\left(\mathrm{3}\right)\:\mathrm{Only}\:\mathrm{when}\:\mathrm{the}\:\mathrm{work}\:\mathrm{done}\:\mathrm{by}\:\mathrm{the} \\ $$$$\mathrm{resultant}\:\mathrm{external}\:\mathrm{force}\:\mathrm{is}\:\mathrm{zero} \\ $$$$\left(\mathrm{4}\right)\:\mathrm{None}\:\mathrm{of}\:\mathrm{these} \\ $$

Commented by ajfour last updated on 25/Nov/17

(3).   (?)

$$\left(\mathrm{3}\right).\:\:\:\left(?\right) \\ $$

Commented by Tinkutara last updated on 25/Nov/17

No.

$$\mathrm{No}. \\ $$

Commented by ajfour last updated on 25/Nov/17

Any explanation to back up ?

$${Any}\:{explanation}\:{to}\:{back}\:{up}\:? \\ $$

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