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Results tagged with energy
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user 172515
Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding the [energy-conservation] tag if it is specifically about its conservation.
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How is energy conserved when a man climbs a stair?
kg climbs a stair of height 10 m.Clearly it gains 5000 J of potential energy.But since work done by normal reaction on the man is zero does'nt it violates the principle of conservation of mechanical energy … because no non-conservative force is acting on the man and thus mechanical energy should be conserved. …
