I suggest you read the Wikipedia article on "energy". There is really no definition of "energy" that's short, easy to understand, and accurate; the reason for this is that "energy" is a fairly complex concept. You might say that it's a magnitude in physics that is conserved - you can't increase or decrease the total amount of energy. However, note that there are several other magnitudes in physics that are also conserved.
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∙ 9y ago*A+*energy
Energy is the term defined as the capacity to do work. It exists in different forms, such as kinetic energy (energy in motion) and potential energy (stored energy).
The term defined as the study of energy and its transformations is thermodynamics. It deals with the relationships between heat, work, and energy in systems.
The term defined as a measure of the energy of motion of particles is kinetic energy. It is dependent on the mass and velocity of an object.
Energy is often defined as the potential for doing work
Thermodynamics
Energy is the term defined as the capacity to do work, whether in the form of matter or energy itself. It can exist in various forms such as thermal, chemical, electrical, and mechanical energy.
Energy is defined as the ability of a system to perform work. It can exist in various forms such as kinetic, potential, thermal, or chemical energy. Energy can be transferred and transformed but cannot be created or destroyed.
Thermodynamics
Mechanical energy is defined as the sum of kinetic energy + potential energy.
A medium is defined as any substance through which wave energy travels.
Internal energy is defined as energy associated with the random, disordered motion of the molecules.