under which condition mechanical energy is not conserved?
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If only internal forces are doing work (no work done by external forces), then there is no change in the total amount of mechanical energy. The total mechanical energy is said to be conserved
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Answer:: Mechanical energy may not be conserved when nonconservative force act . For example when car is brought to a stop by friction on level ground it loses kinetic energy which dissipated as thermal energy , reducing its mechanical energy . Figure 2 compares the effect of conservative and nonconservative force .
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