Moments

• Moment


  Rotational, or turning effect, of a force
• How do you measure the distance when calculating moments

  Perpendicular distance between force and pivot
• Units for moments


  Newton metres (Nm)
• If an object is balanced, what is the relationship between clockwise and anticlockwise moments


  Total clockwise moment = total anticlockwise moment
• Lever


  Increases the size of a force acting on an object. Can be used to move or life things more easily
• How does a lever work?

  Uses principles of moments

  They transmit the turning effect of a force, effectively multiplying the force that gets applied to the object
• Gears?


  Circular discs with ‘teeth’

  The teeth of different gears interlock so that turning one cause another to turn, in the opposite direction
• How are gears used?

  They transmit the rotational effect of a force