Energy transfers

• What is the relationship between energy stores and energy transfer?

  Energy transfer occurs when energy changes form from stores
• Why does the swing have maximum kinetic energy at its lowest point?

  Because it is moving fastest
• What is mechanical energy transfer?

  Energy transfer when an object moves due to force
• What does energy transfer mean?

  Energy moves from one place or system to another
• How does energy transfer occur when energy changes form?

  Energy is transferred during the change of form
• At the lowest point of a swing, what energy is at its maximum?

  Kinetic energy
• How is chemical energy released?

  Released when used, like burning fuel
• What is an energy store?

  An energy store holds energy before transfer
• What happens when you push a ball?

  You transfer energy from muscles to the ball
• What is kinetic energy?

  Energy of movement
• What role do electrons play in electrical energy transfer?

  They move through the circuit to transfer energy
• What is potential energy?

  Energy of position or state
• When kinetic energy is at its maximum, what is happening to gravitational potential energy?

  It is at its minimum
• What does the image of the swing demonstrate?

  Energy changes between potential and kinetic energy
• What does convection involve in the context of heating water?

  Movement of fluids carries heat
• How does radiation transfer heat in the image?

  • Heat is emitted as electromagnetic waves
  • These waves can travel through empty space
  • The waves are absorbed and re-emitted by objects
• How does conduction transfer heat?

  • Heat is transferred through direct contact between objects
  • Heat flows from hotter to cooler objects
  • No movement of the medium is required
• How does conduction transfer heat in the image?

  • Heat is transferred through direct contact between molecules
  • Vibrating molecules pass on kinetic energy to neighboring molecules
  • This allows heat to flow through a solid material
• What can electrical energy transfer be converted into?

  Other forms of energy, like light
• What are the components involved in electrical energy transfer?

  Circuit and moving charges (electrons)
• How does a pan heat water using all three modes of energy transfer?

  • Conduction: Heat travels through the pan's metal
  • Convection: Moving water carries heat
  • Radiation: Heat from the flame travels
• What does the electrical energy do to the phone's battery?

  Increases its chemical energy store
• What are the four modes of heat transfer shown in the image?

  • Convection
  • Conduction
  • Radiation
• What is the role of conduction in heating water in a pan?

  Heat travels through the pan's metal
• What is the name of the process shown in the image where heat is transferred through the circular motion of a fluid?

  Convection
• When is kinetic energy maximum in a swing's motion?

  At the bottom of the swing
• At the highest point of a swing, what energy is at its maximum?

  Gravitational potential energy
• If you wanted to cook food quickly, which mode of heat transfer would be most effective?

  Radiation
• If you wanted to heat up a solid metal object, which mode of heat transfer would be most effective?

  Conduction
• How does radiation transfer heat?

  Heat travels as electromagnetic waves
• How does thermal energy affect materials?

  Causes temperature changes
• How do electromagnetic waves transfer energy?

  They do not need a medium to transfer
• What are the three main modes of heat transfer shown in the image?

  Conduction, Convection, Radiation
• What is the relationship between kinetic energy and gravitational potential energy during a swing's motion, assuming no energy loss to friction or air resistance?

  As one increases, the other decreases
• Why does the swing have maximum gravitational potential energy at its highest point?

  Because it is furthest from the ground
• How often does energy transfer happen?

  All the time
• How does energy change in a swinging motion?

  • At the top: maximum gravitational potential energy
  • As it swings down: potential energy decreases
  • At the bottom: maximum kinetic energy
• What is radiation in the context of energy transfer?

  A heating method using electromagnetic waves
• How does electrical energy transfer occur?

  Through moving charges (electrons) in a circuit
• Why is radiation unique compared to other heating methods?

  It can transfer heat through empty space