Systems/Transfers

• What is a system in physics?


  A system is an object or a group of objects.
• What are some examples of systems in physics?


  • Throwing a ball: ball, hand, muscles
  • Boiling water: kettle, water, heater, electrical components
  • Plane taking off: plane, engine, fuel
• What happens to energy when there is a change in a system?


  There is a change in how energy is stored in it.
• What does g PE stand for?


  Gravitational potential energy.
• What are the energy changes when throwing a ball in the air?

  1. Chemical energy from food to muscles
  2. Muscles do work to give kinetic energy to the ball
  3. Kinetic energy converts to gravitational potential energy as the ball rises
  4. Gravitational potential energy converts back to kinetic energy as the ball falls
• What type of energy does a kettle use to heat water?


  Electrical energy.
• How does a kettle transfer energy to water?

  Electrical energy powers the heater, allowing heat to flow to the water.
• What are the energy changes that occur in a plane as it takes off?

  1. Fuel provides chemical energy
  2. Chemical energy converts to mechanical energy
  3. Mechanical energy allows propellers to spin and the plane to move
  4. Plane gains kinetic and gravitational potential energy
• What does ke stand for?


  Kinetic energy.
• How does fuel contribute to a plane's energy during takeoff?

  Fuel provides chemical energy that is converted into mechanical energy for movement.
• What happens to the plane's kinetic energy as it gains height?


  The plane gains gravitational potential energy as it rises.
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