Work done

• What is Energy?


  Energy is the ability to do work. It can take many forms, including heat, light, sound, and movement.
• What are the types of energy stores you need to know?

  1. Thermal energy stores
  2. Kinetic energy stores
  3. Gravitational potential energy stores
  4. Elastic potential energy stores
  5. Chemical energy stores
  6. Magnetic energy stores
  7. Electrostatic energy stores
  8. Nuclear energy stores
• What happens to energy when it is used?


  • Energy is never used up; it is transferred between different energy stores and objects.
• What occurs when energy is transferred to an object?



  The energy is stored in one of the object's energy stores.
• How is energy transferred?


  Energy is transferred mechanically, electrically, by heating, or by radiation.
• What is a system in the context of energy transfer?


  A system is a single object or a group of objects that you're interested in.
• What happens when a system changes?


  Energy is transferred into or away from the system, between different objects in the system, or between different types of energy stores.
• What is a closed system?


  A closed system is one where neither matter nor energy can enter or leave.
• What is the net change in total energy of a closed system?


  The net change in the total energy of a closed system is always zero.
• What objects have a kinetic energy store?


  Anything moving has energy in its kinetic energy store
• What objects have a thermal energy store?


  Any object- the hotter it is, the more energy it has in this store
• What are thermal energy stores also known as?


  Internal energy stores
• What objects have a chemical energy store?


  Anything that can release energy by a chemical reaction
• What are examples of objects with a chemical energy store?


  • food
  • Fuels
• What objects have a gravitational potential energy store?



  Anything that has mass and is inside a gravitational field
• What objects have a elastic potential energy store?

  Anything that is stretched (or compressed)
• What is an example of an object with a elastic potential energy store?


  Springs
• What objects have a electrostatic energy store?


  Anything with an electric charge that is interacting with another electric charge
• What objects have a magnetic energy store?


  Anything magnetic that is interacting with another magnet
• What objects have a nuclear energy store?


  Atomic nuclei have energy in this store that can be released in nuclear reactions
• What is magnetic energy?


  Energy stored in two separated magnets that are attracting or repelling
• What is nuclear energy?


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


  Energy stored in a warm object
• What is gravitational potential energy?



  Due to an object's position in a gravitational field
• What is kinetic energy?



  Energy stored in a moving object
• What is chemical energy?


  Energy stored in fuels and food
• What is electro static energy?


  Energy stored in two separated charges that are attracting or repelling
• What is elastic potential energy?


  Energy stored in a stretched or compressed object
• What are the 4 ways energy is transferred?


  • Mechanically
  • Electrically
  • Heating
  • Radiation
• What is a system?



  A fancy word for a single object (e.g the air in a piston) or a group of objects (e.g two colliding vehicles) that you're interested in