energy

• extension is directly proportional to force applied
• there is a limit to proportionality where the elastic object wont return to its original shape
• specific heat capacity is the amount of energy required to raise 1kg of a substance by 1 degree
• change in thermal energy = mass x specific heat capacity x change in temperature
• work done = force x distance
• a system is a group of objects
• what is a system

  a group of objects
• what is energy measured in

  joules ( J )
• food fuels and chemical cells store energy

  chemically
• hot objects store energy

  thermally
• moving objects store ------- energy

  kinetic
• objects that can elastically deform store ------- energy

  elastic
• objects that have been lifted up store -----------

  gravitational potential energy
• magnetic objects or objects that are in or near a magnetic field store -------- energy

  magnetic
• the nucleus of atoms and radioactive materials store ------ energy

  nuclear
• charged objects store


  electrostatic energy
• what are all the energy stores

  chemical , thermal , kinetic , elastic potential , gravitational potential , , magnetic , nuclear , electrostatic
• what are the four energy transfers

  heating , mechanically , electrically , radiation
• when a force moves an object work is done
• work done = force x distance
• what is force measured in

  newtons
• what are the none renewable energy resources

  crude oil , gas , coal
• how do fossil fuels generate electricity

  burn fuel - heat water - turn turbine - turn generator -
• what is a renewable energy resource

  one that can be replenished as it is used
• what are the renewable energy resources

  wind , solar, hydroelectric , tidal , biofuels , geothermal , wave power
• advantages of renewable energy resources

  will never run out

  don't add carbon dioxide to the atmosphere
• disadvantages of renewable energy

  not always reliable ( wind and solar )

  can destroy habitats ( hydroelectric )

  only suitable in certain climates
• a lot of energy is used in the UK for transport and most renewable energy resources generate electricity
• biofuels are carbon neutral
• what is the problem with biofuels

  if we use land to grow crops for fuel it could increases the price of food
• what does carbon neutral mean

  achieving net zero carbon emissions by balancing the amount of carbon released with its offset
• kinetic energy is the energy stored in moving objects
• what is kinetic energy?

  the energy stored in moving objects
• what energy is stored in moving objects?

  kinetic
• kinetic energy = 0.5 x mass ( kg ) x speed ( m/s) squared
• kinetic energy = ...

  0.5 x mass x speed squared
• elastic potential energy is the energy stored in a stretched spring or elastic object
• whats is elastic potential energy

  the energy stored in a stretched spring or elastic object
• when a spring reaches its limit of proportionality it wont go back to its original shape
• what happens when i spring reaches its limit of proportionality

  it doesnt return to its original shape