Work done & energy transfer

• What is work done in physics?

  When a force moves an object through distance
• How is energy transferred during work done?

  From one form to another during the process
• Where is energy transferred when moving an object?

  To the kinetic energy store of the object
• What occurs if friction is present while moving an object?

  Some energy is transferred as thermal energy
• What is the formula for work done?

  $w =$$f \times s$
• What does direct proportionality mean in the context of work done?

  Work done is proportional to force and distance
• What occurs when work is done against frictional forces?

  Energy is transferred as thermal energy
• 1 joule =1 Newton metre
• When work done is against frictional forces energy is transferred as heat causing a rise in temperature

  Example : rubbing your hands together converts mechanical energy into thermal energy
• Direct proportionality is work done is directly proportional to both the force applied and the distance moved
• Zero work is if the force does not cause displacement no work is done even if a force is applied
• To move an object with mass a force must be applied which requires energy