Macroscopic modes of energy
If a body is accelerated from its initial velocity  to final velocity  , the total work done on the body is
The work done on a body in accelerating it from its initial velocity to a final velocity , is equal to the change in the kinetic energy of the body. If the body is decelerated from a velocity to a velocity by the application of resisting force, the work done by the body is equal to decrease in its kinetic energy.
- Potential Energy (PE)
- A body of mass m is moved from an initial elevant Z1 to a final elevation Z2(Fig 3.1)
Figure 3.1
- The force on the body, F = mg
- This force has moved a distance ( Z2 - Z1) . Therefore, the work done on the body
The kinetic energy and potential energy are also called organized form of energy that can be readily converted into work.
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