conservation and dissipation of energy

• Kinetic energy is the energy stored by a moving object, measured in joules (J)
• Gravitational potential energy is stored in objects raised above the ground
• Chemical energy is stored in fuels food and batteries
• Thermal energy is the energy stored by hot objects
• Elastic potential energy is the energy stored by stretched or squashed objects
• In a closed system energy cannot be created or destroyed only transferred from one store to another
• Efficiency = useful energy output / total energy input
• Work done = force x distance
• Ek = 1/2 x mass x speed squared
• gravitational potential energy = mass x gravitational field strength x height
• Energy = power x time
• Ee = 1/2 x spring constant x extension squared
• Power = work done / time
• power = rate at which energy is transferred or used up
• Force is measured in newtons
• Distance is measured in metres
• Mass is measured in kilograms
• Speed is measured in metres per second
• Height is measured in metres
• gravitational field strength is measured in newtons per kilogram
• Power is measured in Watts
• Time is measured in seconds
• Spring constant is measured in newtons per metres
• Extension is measured metres
• a closed system is a system that energy can’t enter or leave
• more powerful - doing more in the same times or less time
• What is the prefix symbol for Tera?


  T
• What is the multiplication factor for Tera?

  $x10^{12}$
• What is the prefix symbol for Giga?


  G
• What is the multiplication factor for Giga?

  $x10^{9}$
• What is the prefix symbol for Mega?

  M
• What is the multiplication factor for Mega?

  $x10^{6}$
• What is the prefix symbol for Kilo?

  k
• What is the multiplication factor for Kilo?

  $x10^{3}$
• What is the prefix symbol for Centi?

  c
• What is the multiplication factor for Centi?

  $x10^{-2}$
• What is the prefix symbol for Mili?


  m
• What is the multiplication factor for Mili?

  $x10^{-3}$
• What is the prefix symbol for Micro?

  μ
• What is the multiplication factor for Micro?

  $x10^{-6}$