conservation of energy

• What is the conservation of energy principle?

  Energy can be transferred, stored, or dissipated
• What does the conservation of energy principle imply about energy?

  Energy cannot be created or destroyed
• How does charging a phone illustrate the conservation of energy principle?

  Electrical energy converts to chemical energy in the battery
• What happens to chemical energy when you use your phone?

  It converts back to electrical energy
• What type of energy is produced by the phone's screen?

  Light energy
• What type of energy is produced by the phone's speaker?

  Sound energy
• What is meant by wasted energy?

  Energy transferred to unintended forms
• What is the common form of wasted energy when using a phone?

  Heat energy
• What defines an open system in physics?

  Energy and matter can move freely
• In the phone example, what is considered the environment?

  Everything outside the phone
• What is a closed system in physics?

  Energy and matter cannot enter or escape
• What happens to heat energy in a closed system with a phone in a jar?

  Heat energy dissipates to the air inside
• What does it mean for the overall energy of a closed system?

  It doesn't ever change
• What are the key concepts of the conservation of energy principle?

  • Energy can be transferred, stored, or dissipated
  • Energy cannot be created or destroyed
  • Energy moves between different objects and forms
• What are the differences between open and closed systems?

  Open System:

  • Energy and matter can move freely
  • Example: Phone in use

  
  

  Closed System:

  • Energy and matter cannot enter or escape
  • Example: Phone in a sealed jar