friction is a non conservative force why
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A nonconservative force is one in which the work done in moving an object/particle is dependent upon the path taken. A conservative force is path-independent, and depends only on the position of an object.
Gravity is an example of a conservative force.
The force of friction, however, is path-dependent. For example, if we push an object 1m across a rough surface, less energy will be lost as heat than if we push that same object 5m across the same surface. The work done (energy lost in this case) is dependent on the path taken.
A nonconservative force is one in which the work done in moving an object/particle is dependent upon the path taken. A conservative force is path-independent, and depends only on the position of an object.
Gravity is an example of a conservative force.
The force of friction, however, is path-dependent. For example, if we push an object 1m across a rough surface, less energy will be lost as heat than if we push that same object 5m across the same surface. The work done (energy lost in this case) is dependent on the path taken.
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Forces that do not store energy are called nonconservative or dissipative forces. Friction is a nonconservative force, and there are others. Any friction-type force, like air resistance, is a nonconservative force. The energy that it removes from the system is no longer available to the system for kinetic energy.
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