Fast quick Energy Conservation Question

[godkills]

For energy conservation does it apply to both conservative and non conservative forces?

 

[cepheid]

For energy conservation does it apply to both conservative and non conservative forces?

Mechanical energy (kinetic + potential) is conserved only if conservative forces act. If non-conservative forces act, then the sum of potential + kinetic energy may not be conserved. However, total energy is always conserved. It's just that when non-conservative forces act, the energy is converted into forms other than kinetic or potential.

 

[ashishsinghal]

Take friction for example. The kinetic energy is lost in the form of sound and heat. Total energy remains conserved but mechanical energy is lost.