work done

• Energy is the ability to do work
• Living things need energy for the processes that keep them alive and active
• Non-living things also need energy to work
• Work done is the use of a force to move an object in the direction of the force
• Conditions for work to be done

  • There is a force acting on an object
  • The object moves
  • The object moves in the direction of the force
• The amount of work done depends on the size of the force applied and the distance moved by the object in the direction of the force
• The SI unit of work is the joule (J). One joule is the work done when a force of one Newton moves an object by one metre in the direction of the force
• A larger unit of work is the kilojoule (kJ). 1 kJ = 1000 J
• Equation for Work Done

  Work done = Force x Distance (in Joules) where W is the work done, F is the constant force, and d is the distance moved in the direction of the force
• When work is done, energy is transferred from one object to another
• Energy and Work

  Work done = Energy transferred
• The unit of work (joule) is also the unit for energy. When one joule of work is done, one joule of energy is transferred