Statement-1: Toul mechanical energy of a particle may be...

Statement-1: Toul mechanical energy of a particle may be conserved, cven if there are nonconservative forecs acting on the parlicle. Statement-2: Work done by non-conservative forecs acting on a particle may be zero.

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Key Concepts

Nonconservative Forces

These are forces for which the work done depends on the path taken, rather than solely on the initial and final positions. They have the ability to dissipate energy as heat or other forms and, in general, can change a system’s mechanical energy, although in some cases, their net work can be zero.

Work Done by Forces

Work is defined as the energy transferred by a force acting over a displacement. In the context of mechanical energy, the work done by nonconservative forces can either add to or subtract from mechanical energy. However, when the net work done by these forces is zero, the mechanical energy remains unchanged.

Conservation of Mechanical Energy

This principle states that the total mechanical energy of a system (the sum of kinetic and potential energies) remains constant when there is no net work done by nonconservative forces. Even if nonconservative forces are present, if their net work is zero, the mechanical energy remains conserved.

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