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In physics, energy is an indirectly observed quantity that is often understood as the ability of a physical system to do work on other physical systems. Since work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length.
Energy may be stored in systems without being present as matter, or as kinetic or electromagnetic energy..
ability to do work or capacity to do work is called energy. energy is occur in various forms.in every field, in every work, we need energy. all the phenomenon whether it is natural or not need energy, without energy nothing in the world can move even earth also need energy for its rotations.
Energy found in many form but we can simply say that energy neither created nor destroyed; it simply converts to one form to another. Examples of energy kinetic, potential, thermal, gravitational, elastic, electromagnetic, chemical, nuclear, and mass. Energy can be expressed in joules or ergs. In biology energy is stored in bio-molecules. Like carbohydrates (sugars) and lipids. The energy released from them when they are oxidized during cellular respiration is carried and transported by an energy-carrier molecule called ATP.
Uses of energy:
Mechenically used in vechile.
Chemically used in water.
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