Transcript Document
GPE and KE Gravitational Potential Energy (GPE) • This is the energy an object possesses due to its height above the ground. Kinetic Energy (KE) • This is the energy an object has due to its speed. • When an object falls it converts its potential energy into Kinetic energy. • The GPE of water in a dam can be extracted as it falls. Elastic Potential energy (EPE) • Any material that is stretched or compressed stores elastic potential energy. • A wound up clock spring can be used to store elastic potential energy. This energy can then released over a few days to make the clock work. • Both the springs in a car suspension and the tyres absorb energy when the car travels over rough ground. • The bungee cord is elastic and absorbs the kinetic energy of the jumper. Chemical Energy • Chemical energy is the energy stored in the bonds between atoms. • Making the bonds between atoms can store energy. • Breaking the bonds between atoms can release energy. The chemical bonds inside food can be broken down to release energy for us to live. The chemicals inside a battery store chemical energy ready to be released as electricity. Heat Energy • When chemical react they can release chemical energy in the form of Heat energy. For example burning wood/coal releases chemical energy as heat. Heat can be described as the KE and EPE of molecules. Electrical Energy • Electrical energy is the flow of charge/electrons in a circuit due to a voltage. Printed circuit board in a TV Lightning is an example of nature producing its own electric currents in the atmosphere. Lightning Bolt Sound Energy The vibrations which are passed between atoms in a material we call sound. slploudmouth.mpeg Electromagnetic Waves Gamma rays X- rays UV Infra-red Radio Waves Nuclear Energy • The strong bonds between the particles inside a nucleus store nuclear energy. • When the bonds are broken during a nuclear reaction a lot of energy can be released. (About a million times more than a chemical reaction) In a nuclear bomb all the energy in a lump of Uranium or Plutonium is quickly released. In a nuclear reactor the energy is released slowly so that it can be used to generate electricity.