Energy Transfers

• Thermal Energy: the energy stored due to an object's temperature
• Conservation of Energy - Energy can be transferred usefully, stored or dissipated but cannot be created or destroyed
• A system is an object or a group of objects
• In a closed system, no energy can enter or leave
• Pendulum Diagram

  
• Friction causes energy to be transferred to thermal energy
• The stores of thermal energy are less useful - The energy has been dissipated (wasted)
• We can reduce unwanted energy transfers by reducing friction