The Energy of the' Earth. Consider, for instance, the energy involved in the earth 's motion, both orbital and rotational. The earth flies along in its orbit with a velocity of about twenty miles ...

Forces are responsible for changing the motion of objects ... explain some of the most important interactions in nature. Energy, work and power Energy is a key principle in physics.

Motor two does this in 10 seconds. Since twice as much energy is transferred by motor one each second, it is possible to say that motor one is twice as powerful as motor two.