- Created by: candice williamson
- Created on: 09-11-16 12:56
Physics - Stores of energy:
Stores of energy
Energy can be stored in different ways, including:
- kinetic energy
- internal energy
- elastic potential energy
- gravitational potential energy
- electrical energy
- magnetic energy
Moving things have kinetic energy. The more mass a thing has and the faster it moves, the more kinetic energy it has. All moving things have kinetic energy, even very large things like planets, and very small ones like atoms.
All objects have internal energy. This includes:
- energy caused by the movement of particles in the object, sometimes called thermal energy
- energy due to the bonds between particles, sometimes called chemical energy
Elastic potential energy
Some objects can change shape reversibly. Rubber balls, springs and elastic bands are like this. When a rubber ball is stretched or squashed, it can regain its shape again. Elastic potential energy is stored in stretched or squashed materials.
Gravitational potential energy
When an object is moved higher, it gains gravitational potential energy. The amount of energy it gains depends upon:
- the mass of the object
- the extra height it gains
- the gravitational field strength
Some objects carry electrical charges and create electric fields. These charged objects can exert forces on each other. You get an electric current when charged particles move through a wire.
Some objects can be magnetised and create magnetic fields. They can exert forces on other magnetised objects, or on magnetic materials.
Energy can transfer or move from one store to another in different ways. Devices such as lamps and heaters may be involved, or processes such as combustion. For example, energy can be transferred:
- by heating
- by radiation
Some objects are hotter than others. Energy is transferred from the hotter object to the cooler one, and the difference in temperature between them decreases.