conservation of energy

• Energy


  The capacity for doing work
• Energy


  • It cannot be created or destroyed but it can be transferred, dissipated or stored in different ways
• Energy stores


  Different forms that energy can take, such as gravitational potential energy, kinetic energy, internal energy, chemical energy
• Energy transfers


  Energy is transferred from one store to another
• Energy dissipation


  The spreading out and transfer of energy stores into less useful forms, such as thermal energy causing the surroundings to heat up
• All the energy in the Universe was present at the Big Bang and will still be around at the very end of time
• Examples of conservation of energy

  • Skydiver
  • Smartphones
• Skydiver example


  1. Gravitational potential energy decreases

  2. Kinetic energy increases

  3. Some energy transferred to internal energy of air particles
• Smartphone example


  Chemical energy in battery transferred to light, sound, and internal energy (heat)
• Many smartphones also heat up when used, so chemical energy is transferred into internal energy
• The atoms in the smartphone's conductors emit infrared radiation