Asked by shreehari wadawadagi | 17th Nov, 2013, 07:00: PM

Expert Answer:

Frictional force can never increase the mechanical energy of a system.
Mechanical energy = potential energy + kinetic energy
Frictional force opposes the motion of a system. Hence system has to do some work against the frictional force, which leads to decrease in the mechanical energy of the system.

Answered by Komal Parmar | 18th Nov, 2013, 07:14: PM

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