- Energy is one of the most basic ideas of science.
- All activity in the universe can be explained in terms of energy and matter.
- One of the best known translations of energy is the classical definition used in physics; Energy is the ability to do work.
- Physicists define work in a way that does not always agree with the average
person's idea of work. - In physics, work is done when a force is applied to an objects motion to move it some distance in the direction of the force.
- If a person walks up a flight of stairs he may say it's not the same as work when he makes effort to move his body to a higher level.