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Solved: Is it possible for a friction force to increase
Chapter 7, Problem 7DQ(choose chapter or problem)
QUESTION:
Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.
Questions & Answers
QUESTION:
Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.
ANSWER:Solution 7DQ
Step 1:
Mechanical energy = Kinetic energy + Potential energy
Total energy of the system = Kinetic energy + Potential + Work done against frictional force
Therefore, TE = KE + PE + W
Rearranging the equation, TE - W = KE+PE
So, we can write. Mechanical energy = TE - W