*turning effects of forces

• a lever


  an object that turns
• Pivot


  the point around which the lever turns
• The Moment of a force

  its turning effect of a force
• The moment of a force depends on:

  • the size of the force (the greater the force, the bigger the moment)
  • the distance between the position where the force acts and the pivot (the greater the distance the greater the moment)
• Moment


  = force x distance

  
  

  (distance in equation is the distance from the pivot to the position where the force acts)
• Unit of force


  the newton
• Unit of distance


  the metre
• Newton metre


  the unit of moment is newton x metre, which is written as *Nm*
• Balancing


  for example; a seesaw which will be balanced when the moments on both sides of the pivot are equal and opposite

  each person moves up and down as ppl sit on either side of the pivot and make the lever turn one way or the other

  1st class lever