What is the name for mechanical heat?

The term "mechanical heat" refers specifically to the heat generated from mechanical processes, primarily due to friction when two surfaces come into contact and move against each other. This phenomenon is most accurately described as heat of friction.

When components such as machinery parts or moving objects experience resistance, the kinetic energy from their motion is converted into thermal energy, which raises their temperature. This process exemplifies how mechanical forces can create heat as a byproduct of movement and contact, making "heat of friction" the correct terminology in this context.

The other options refer to different types of heat energy. For instance, heat of tension might imply energy related to materials under stress without movement, heat of motion could suggest energy from movement in a more general sense but isn't specific to friction and doesn’t encompass the generation of heat as directly caused by the interaction of surfaces. Heat of pressure, while related to forces exerted over areas, does not specifically account for the frictional heat produced during mechanical operations. Thus, the correct association of mechanical heat is exemplified by heat of friction.