Energy Stores

• What is the principle regarding energy in physics?

  Energy is never created or destroyed
• What does the principle of energy transfer imply?

  Energy is transferred between different forms and objects
• What are the different forms of energy mentioned?

  • Thermal or internal energy
  • Kinetic energy
  • Gravitational potential energy
  • Elastic potential energy
  • Chemical energy
  • Magnetic energy
  • Electrostatic energy
  • Nuclear energy
• What is thermal energy related to?

  It is related to the temperature of an object
• What is kinetic energy associated with?

  Movement or motion of an object
• What does gravitational potential energy depend on?

  Position in a gravitational field
• What is elastic potential energy?

  Energy held in an already stretched spring
• What is chemical energy held in?

  Chemical bonds
• What is magnetic energy responsible for?

  Holding magnets to your fridge
• What does electrostatic energy cause?

  Occasional shocks when touching a car
• What is nuclear energy derived from?

  Breaking atoms apart
• How can energy be transferred between stores?

  Mechanically, electrically, by heating, or radiation
• What is a system in physics?

  A collection of matter
• What happens in an open system?

  It can exchange energy with the outside world
• What is a closed system?

  Separate from the outside world
• What happens to energy in a closed system?

  Overall change is always zero
• How does energy transfer occur in a kettle?

  1. Electrical energy flows to the heating element
  2. Heating element transfers energy to water
  3. Water's thermal energy store increases
• What does "work done" refer to in energy transfer?

  Energy transferred when a force moves an object
• What are the two main types of work done?

  Mechanical and electrical
• What is electrical work done related to?

  Current flowing and overcoming resistance
• How does friction do work on a train?

  Slows the train by transferring energy to heat
• What is the relationship between work done and energy transfer?

  • Work done is energy transferred
  • Can occur mechanically or electrically
  • Involves forces acting on objects