Moment

• Moment

  Force (N) x distance (m)
• Using the moments equation


  1. Write the force and the distance on your diagram

  2. Calculate the moment of the force using this information
• Moment of the force

  • 50N x 0.4m = 20Nm
• Moment of the Force (Nm)

  Force (N) x Distance from pivot (m)
• Moment of the force: 20 Nm
• If the distance from the pivot is bigger

  The moment would be bigger
• Principle of Momente


  A system is in equilibrium (balance) when:
• Moments of Force


  • Depends on:
  • Distance from pivot (d)
  • Force (F)
• Calculating Moments of Force

  Moment = Force (N) x Distance (m)
• Calculating Moments of Force

  • Example 1: Force of 10N, 30cm from pivot, Moment = 3Nm
  • Example 2: Force of 150N, 10cm from pivot, Moment = 15Nm
  • Example 3: Force of 10N, 0.5m from pivot, Moment = 5Nm
• A moment is the turning effect of a force
• To balance a beam

  Moments on each side must be equal
• Balancing a beam

  • Example 1: Cat 50N, 1m from pivot, Mouse 0.5N, 100m from pivot to balance
  • Example 2: James 200N, 1m from pivot, Jane 100N, 2m from pivot to balance
• Moments are measured in Newton-metres (Nm)
• Distances must be converted to metres (m)