In physics, energy is a physical quantity that can be associated with the motion of matter and other forms of potential and kinetic energy. In short, it is the ability of a system to do work.
Other related questions:
Q: What is the physical quantity of energy?
A: There is no single answer to this question as energy can be expressed in many different ways. Some common units of energy include joules, calories, and electron volts.
Q: What physical quantity has the same unit as energy?
A: The unit of energy is the joule.
Q: What is the physical quantity of heat?
A: Heat is a type of energy that is transferred between two objects or systems that are at different temperatures.
Q: What is the physical quantity of momentum?
A: Momentum is a vector quantity that describes the motion of an object. It is equal to the mass of the object times its velocity.