energy stores and transfers

• What is a system in physics?

  An object or group of objects
• What happens when something changes in a system?

  Energy is transferred between its parts
• What defines a closed system?

  No energy can escape or enter
• What happens to the total energy in a closed system?

  The total energy never changes
• What is kinetic energy?

  Energy an object has because it is moving
• What is gravitational potential energy?

  Energy due to an object's height above ground
• What is elastic potential energy?

  Energy an elastic object has when stretched
• What is thermal energy?

  Energy due to an object's temperature
• What is chemical energy?

  Energy transferred by chemical reactions
• What is nuclear energy?

  Energy stored in the nucleus of an atom
• What is magnetic energy?

  Energy a magnetic object has near a magnet
• What is electrostatic energy?

  Energy a charged object has near another charged object
• How is energy transferred through heating?

  From one object to another with lower temperature
• How do waves transfer energy?

  By radiation, such as light and sound waves
• How does electricity transfer energy?

  When an electric current flows
• How is energy transferred by forces?

  When a force moves or changes an object's shape
• Why is energy never entirely transferred usefully?

  Some energy is always dissipated
• Where does all energy eventually end up?

  In the thermal energy store or surroundings
• What is lubrication used for?

  To reduce unwanted energy transfer due to friction
• What is streamlining used for?

  To reduce energy wasted due to air resistance
• How does thermal insulation help with energy transfer?

  It reduces energy wasted due to heat dissipation