Chapter 4.3, Problem 30R

To determine

To Explain: The way friction affects the mechanical energy of a system.

Explanation of Solution

Introduction:

Mechanical energy is sum of potential energy and kinetic energy.

Mechanical energy remains conserved in a closed system in the absence of dissipative forces. When friction is present, the kinetic energy of the system decreases which implies that mechanical energy decreases.

Conclusion:

Due to friction, the mechanical energy of the system decreases.