Question

What is a conservative force? Prove that gravitational force is conservative and frictional force is non-conservative.​

Answer 1

 force is said to be conservative if work done by the force is independent of the path followed and depends upon the initial and final positions

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Answer 2

A conservative force is a force with the property that the total work done in moving a particle between two points is independent of the taken path. ... If a force is conservative, it is possible to assign a numerical value for the potential at any point.