The principle of mechanical energy conservation do not hold in the presence of friction because the friction reduces the kinetic energy which in turn reduces the mechanical energy.
What is the principle of conservation of mechanical energy?
The principle of conservation of mechanical energy states that if a body or system is acted upon by conservative forces, the mechanical energy of that body or system remains constant.
Friction decreases the kinetic energy which in turn decreases the mechanical energy.
The energy of a system in the presence of friction would transform to potential energy.
Therefore, the principle of mechanical energy conservation do not hold in the presence of friction because the friction reduces the kinetic energy which in turn reduces the mechanical energy.
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