Forms of energy, energy transformations, and Law of Conservation of Energy
Thermal energy (or heat energy)
A type of kinetic energy. Energy of moving particles - faster moving particles means higher temperature. Even cold objects have thermal or heat energy. Cold objects have particles vibrating more slowly. Examples - stove, match, oven, fire.
Radiant (or Light) energy
A type of kinetic energy. Transmitted through space in the form of electromagnetic waves. Examples - visible light (from a light bulb or the sun), x-rays, radio waves and microwaves.
Stored mechanical energy
A form of potential energy. The energy of stored in object by applying a force. Examples - a stretched bow (ready to shoot an arrow), a Jack-in-the-box toy.
A form of kinetic energy. Energy from moving electrons. Examples - lightning, electrical outlet.
A form of kinetic energy. The vibration of particles. As the particles vibrate, they transfer the sound energy to air particles and eventually making it to your ears. Examples - a gong, musical instruments.
A form of potential energy. Energy stored in substances like food and fuels. It is released when it reacts. Examples - food, fossil fuels, batteries, biomass.
What energy transformation takes place when you rub your hands together?
Mechanical energy of moving hands transforming into both sound energy and heat energy.
What energy transformation occurs when you eat food?
Chemical energy is changed to mechanical energy (as you move).
What kind of energy transformation occurs in a flashlight that runs on batteries?
Chemical energy to electrical energy and then into radiant (or light) energy along with some thermal energy.
What energy transformation occurs in an electric hot plate, such as what we have in the science labs?
Electrical energy is transformed into thermal (or heat) energy.
Law of Conservation of Energy
Energy cannot be created or destroyed - it can only change form
A form of kinetic energy. The movement of objects.
A form of potential energy. Results from place or position of an object. For example - a tennis ball has more gravitational potential energy when it is held from at a higher point.