P1 - Energy transfers

• Define elastic potential energy

  The energy stored in an object which is stretched, squashed, or deformed.
• What are the ways to reduce unwanted energy transfer?

  • Use thicker materials to prevent heat loss
  • Lubrication to decrease heat caused by friction
  • Thermal insulation to prevent heat loss
• Describe the changes in the energy stores of a falling skydiver

  • Gravitational potential energy store decreases
  • Kinetic energy store increases
  • The GPE is transferred into kinetic energy
• Why does a material with low thermal conductivity cool down slower?

  It transfers thermal energy more slowly and might act as an insulator.
• Describe the Law of Conversation of Energy?

  Energy can be transferred usefully, stored or dissipated, but it cannot be created or destroyed.
• What is a system?

  A system is an object or a group of objects
• The higher the thermal conductivity of a material,

  the higher the rate of energy transfer by conduction across the material