What aspect of mechanical energy is highlighted?

Mechanical energy is defined as the sum of kinetic energy and potential energy in a system. Kinetic energy is associated with the motion of an object, while potential energy is related to the position or state of an object in a system. The concept of mechanical energy highlights that both types of energy can be present at the same time in a system, contributing to the total energy that can be used to perform work.

For example, a roller coaster at the top of a hill possesses potential energy due to its elevated position, which is converted to kinetic energy as it descends. This interplay is crucial in understanding how energy is conserved and transformed in mechanical systems. Therefore, recognizing that mechanical energy includes both kinetic and potential energies provides a more comprehensive view of how energy operates in physical contexts.