Question

What do you understand by conservation of mechanical energy ? state one condition under which mechanical energy is conserved

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Answer 1

Answer:

According to the law of conservation of mechanical energy, whenever there is an interchange between the potential energy and kinetic energy, the total mechanical energy (i.e., the sum of kinetic energy K and potential energy U) remains constant i.e., K + U = constant when there are no frictional forces. Mechanical energy is conserved only when there are no frictional forces for a given system (i.e. between body and air). Thus, conservation of mechanical energy is strictly valid only in vacuum, where friction due to air is absent.

Answer 2

Explanation:

Mechanical energy is the sum of Potential Energy and Kinetic Energy. The only condition under which mechanical energy is conserved is that all the forces acting on it should be conservative forces.