efficiency and energy stores

• What is the dissipation of energy

  • energy being transferred to it's surrondings which can be wastsed
• What is useful energy

  • energy designed for it's intended purpose
• what is non useful energy

  • energy that is spread to it's surrondings
• examples of energy transfers a bat hitting a ball

  • when a bat hits a ball the kinetic energy of the bat is transferred mechanically to the ball thermal store
  • some energy is dissapted by heating
• kinetic energy stores in a motor

  • motor is moving so kinetic energy is transferred to the object it's pulling uo
  • motor does friction against the object so energy is dissapted as heat
• What are the two ways of reducing energy loss

  • insulation
  • lubrication
• How does lubrication reduce energy loss

  • helps reduce friction in parts of a cycle
  • objects that moves have friction working against them transferring kinetic energy to thermal energy making it less useful
  • lubricants are usually oil/liquids so they can flow between the object
• What is thermal conduction

  • thermal conduction is where energy is transferred through particles in a substance
  • the vibrating particles are transferred from their kinetic energy store to the store of neighbouring particles
• what is the direction of thermal conduction

  • hot to cold
  • the higher thermal conductivity of an object,the higher rate of energy transfer via conduction
• What is efficiency

  • the ratio of useful energy output / total energy input