Energy Energy is defined as the capacity to do work. Whenever work is done, energy is transformed from one system to another. Energy is measured in Joules.

Potential Energy Potential Energy (PE) is called the energy of position because it results from the relative positions of objects in a system. A stretched rubber band has PE. Gravitational Potential Energy- depends on the mass of the object and its height relative to Earth’s surface.

Kinetic Energy Kinetic energy (KE) is the energy of the object due to its motion. KE depends on mass… a bowling ball can do more work than a tennis ball when moving at the same speed. Atoms and molecules have kinetic energy

Energy Mechanical Energy Living Things Mechanical energy is the amount of work an object can do because of its kinetic and potential energy. Living things get their energy from the sun.