Angular acceleration is the rate of change of angular velocity. Angular acceleration is usually expressed in rad / s² and is denoted by a Greek letter α (alpha). Angular acceleration is a vector quantity.

Mechanical advantage (M.A.) is the ratio of load lifted (W) to the effort applied (P).

The strain energy stored in a body due to external loading within the elastic limit is known as resilience.
Joule per cubic meter is the SI unit of measurement of resilience.