conservation of energy

• What is a closed system

  • a system where this no net change to the total energy to that system
  • the amount of energy must remain constant due to the law of conservation of energy
• give an example of a system where energy stores changes

  • an apple on a table is seen as a system - because there no forces acting on the table of the apple the apple just sits there
  • if the table is removed the apple is dropped and energy is transferred to it's gravitional store
• what is the law of conservation of energy

  • energy cannot be created or destroyed but only transferred from one system to another
  • total energy in a closed system remains constant and total energy transferred in = total transferred out
• what is dissapted energy

  • energy that is not used for it's desired purpose
  • energy is disappeared to it's surrondings
• what are the 8 types of energy stores

  kinetic

  gravitional

  elastic

  thermal

  chemical

  nuclear

  magnetic

  electrostatic
• what is kinetic energy store

  • any object that moves have energy
• what is thermal and chemical energy store

  thermal - any object that has heat in it's energy stire

  chemical energy store - any object that releases energy via a chemical reaction
• what is nuclear energy store

  • atomic nuclei releasing their energy store during nuclear reactions
• what is electrostatic and magnetic energy stores

  • electrostatic - objects with charge ( like protons and neutrons) reacting with each other to have energy in their store
  • magentic - magenta interacting with themselves in their energy stores
• what is elastic and gravitional stores

  • gravitional stores - any object that falls/is lifted above the ground
  • elastic - any energy store that can be stretched
• what are the 4 ways energy can be transferred

  • mechnically
  • by electricty
  • by radiation
  • by heating
• what is mechincal transfer

  • when a force acts on an object (pulling stretching etc)
• what is electrical transfer

  • a charge moving through a potential difference
• what is energy transferred from heating

  • energy transferred from a hotter object to a warmer one
• what is energy transferred by radiation

  • energy transferred via radiation such as electromagnetic waves