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Question

select the correct alternative.


A
work done by kinetic friction on a body always results in a loss of its kinetic energy.
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B
Work done on a body, in the motion of that body over a closed loop is zero for every force in nature.
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C
Total mechanical energy of a system is always conserved no matter what type of internal and external forces on the body are present.
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D
When total work done by a conservative force on the system is positive then the potential energy associated with this force decreased.
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Solution

The correct option is D When total work done by a conservative force on the system is positive then the potential energy associated with this force decreased.
$$w=-\triangle u$$     (For conservative forces on the system)
$$\triangle u=-w$$
If work done is $$+ve$$,
Then $$\triangle u=-ve$$ 
$$\therefore$$ Potential energy decreases.

Physics

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