5+Unit+2+Energy+&+The+Environment+(Introduction)

=What is ENERGY?=

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__**What is energy?**__
 * Energy** is the capacity of a system to do work. That system may be a jet, carrying hundreds of passengers across the ocean. A baby’s body, growing bone cells. A kite, rising on the wind. Or a wave of light crossing a space.

__**What is Kinetic Energy?**__ The **kinetic energy** of an object is the [|energy] which it possesses due to its [|motion]. It is defined as the [|work] needed to accelerate a body of a given mass from rest to its stated [|velocity]. Having gained this energy during its [|acceleration], the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest.

__**What is Potential Energy?**__
 * potential energy** is the [|energy] stored in a [|body] or in a [|system] due to its position in a [|force field] or due to its configuration



__**What is Work?**__ **Work ** can be defined as transfer of energy. In physics we say that work is done on an object when you transfer energy to that object. If one object transfers (gives) energy to a second object, then the first object does work on the second object. Work is the application of a force over a distance. Lifting a weight from the ground and putting it on a shelf is a good example of work. The force is equal to the weight of the object, and the distance is equal to the height of the shelf.

Power is the rate at which work is done. It is the work/time ratio. Mathematically, it is computed using the following equation.
 * __What is power? __**

__**Joule**__ The SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force, equivalent to one 3600th of a watt-hour


 * __Watt__**

The SI unit of power, equivalent to one joule per second, corresponding to the rate of energy in an electric circuit where the potential difference is one volt and the current one ampere.