Question

Of the following, which is NOT a conservative force?

• A. Gravitational attraction
• B. Elastic force provided by an ideal spring
• C. Magnetic attraction (no contact)
• D. Kinetic friction between two surfaces
• E. None of these

Answer 1

The correct option is D Kinetic friction between two surfaces

A conservative force is defined , if the work done by or against the force in moving a body depends only on the initial and final position of the body and not on the nature of path followed by the body .

we can see that among all the given forces only kinetic friction depends upon the length and nature of path followed by a body therefore it is non-conservative force .All other forces are conservative forces .