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Potential Energy Kinetic Energy Potential energy is stored energy and the energy Kinetic energy is motion — of waves, electrons, of position — gravitational energy. There are atoms, molecules, substances, and objects. several forms of potential energy. Radiant Energy is electromagnetic energy that travels in transverse waves. Radiant energy includes visible light, x-rays, gamma rays and radio waves. Light is one type of radiant Chemical Energy is energy stored in the bonds energy. Sunshine is radiant energy, which of atoms and molecules. Batteries, biomass, provides the fuel and warmth that make life on petroleum, natural gas, and coal are examples of Earth possible. stored chemical energy. Chemical energy is Thermal Energy, or heat, is the vibration and converted to thermal energy when we burn wood in a fireplace or burn gasoline in a car's movement of the atoms and molecules within substances. As an object is heated up, its atoms engine. and molecules move and collide faster. Mechanical Energy is energy stored in objects Geothermal energy is the thermal energy in the by tension. Compressed springs and stretched Earth. rubber bands are examples of stored mechanical Motion Energy is energy stored in the energy. movement of objects. The faster they move, the Nuclear Energy is energy stored in the nucleus more energy is stored. It takes energy to get an of an atom — the energy that holds the nucleus object moving, and energy is released when an together. Very large amounts of energy can be object slows down. Wind is an example of released when the nuclei are combined or split motion energy. A dramatic example of motion apart. Nuclear power plants split the nuclei of is a car crash, when the car comes to a total stop uranium atoms in a process called fission. The and releases all its motion energy at once in an sun combines the nuclei of hydrogen atoms in a uncontrolled instant. process called fusion. Sound is the movement of energy through Gravitational Energy is energy stored in an substances in longitudinal object's height. The higher and heavier the (compression/rarefaction) waves. Sound is object, the more gravitational energy is stored. produced when a force causes an object or When you ride a bicycle down a steep hill and substance to vibrate — the energy is transferred pick up speed, the gravitational energy is being through the substance in a wave. Typically, the converted to motion energy. Hydropower is energy in sound is far less than other forms of another example of gravitational energy, where energy. the dam "piles" up water from a river into a Electrical Energy is delivered by tiny charged reservoir. particles called electrons, typically moving through a wire. Lightning is an example of electrical energy in nature, so powerful that it is not confined to a wire.