Moments

• What is meant by a moment in physics?

  The turning effect of a force
• How do you calculate the size of a moment?

  Moment = Force × Distance
• What is the unit for moment?

  Newton meter (N m)
• What must the distance be when calculating a moment?

  Perpendicular from the line of action to the pivot
• If a force of 50 newtons is applied at a distance of 0.3 meters, what is the moment?

  $15 \text{ N m}$
• Why can't you use the distance from the pivot to the force if the spanner is at an angle?

  Because it must be the perpendicular distance
• What is the moment produced by a force of 75 newtons at a distance of 1.2 meters?

  $90 \text{ N m}$
• What are the key points to remember when calculating moments?

  • Moment = Force × Distance
  • Unit is Newton meter (N m)
  • Use perpendicular distance to the pivot
• What are some examples of moments in everyday life?

  • Wheelbarrow
  • Crowbar
  • Seesaw
  • Crane
  • Hammer