What does “Conservation of mechanical energy” actually mean in Work, Energy & Power, and why does it matter for JEE?
when only conservative forces act, KE + PE stays constant.
In simple words: when only conservative forces act, KE + PE stays constant. Getting Conservation of mechanical energy clear matters because JEE questions on Work, Energy & Power usually test this idea directly, not just a formula you memorised.
Key point
Conservation of mechanical energy
Common mistake
applying it when friction or other non-conservative forces are present.
Memory tip
if there's friction, account for the energy lost as heat.
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