Moments

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Moments

  1. 1. Moments<br />Notes<br />Moment = F x perpendicular distance from pivot<br />Sum of clockwise moments = Sum of anticlockwise moments<br />To increase an object’s stability,1. Lower its CG2. Make its base as wide as possible<br />Workout Questions<br /><ul><li>Two boxes lie on opposite sides of an unbalanced see-saw as shown below. How should box B be moved, in order to balance the see-saw?
  2. 2. B: 2kg
  3. 3. 5.5m3mA: 7kg
  4. 4. 2.5m to the left
  5. 5. 5m to the left
  6. 6. 5m to the right
  7. 7. 2.5m to the right
  8. 8. Why does a tightrope walker carry a long pole when performing?
  9. 9. To look more impressive
  10. 10. To keep his centre of gravity vertically above the rope
  11. 11. To increase his mass to that the rope is more taut
  12. 12. To spread his weight out evenly
  13. 13. A metre rule of weight 100g is pinned on a wall such that it is allowed to swing freely. The pin is at the 40cm mark. A weight of 500g is hung at the 0cm mark. What is the resultant moment about the pivot?
  14. 14. 1.9 Nm clockwise
  15. 15. 1.9 Nm anticlockwise
  16. 16. 19 Nm clockwise
  17. 17. 19 Nm anticlockwise
  18. 18. A plank of mass 5kg lies on a pivot. It is 10m long. Draw another diagram showing how a block of 10kg can be placed on it such that the plank now lies parallel to the ground.
  19. 19. 3m
  20. 20. There is a door fixed to a wall by two hinges.
  21. 21. A
  22. 22. B
  23. 23. CD
  24. 24. State which door knob will require the least force to open the door.
  25. 25. ________________________________________________________________________
  26. 26. Explain.
  27. 27. ________________________________________________________________________
  28. 28. As a cyclist pedals, the positions of the pedals change as shown in diagrams A, B and C. The force that he applies on the pedals is constant throughout his journey.
  29. 29. At which position is the cyclist exerting the largest moment about the pivot? Explain.
  30. 30. ___________________________________________________________________________
  31. 31. ___________________________________________________________________________
  32. 32. At which position is he exerting the smallest moment about the pivot? What is the magnitude of this moment? Explain.
  33. 33. ___________________________________________________________________________
  34. 34. ___________________________________________________________________________
  35. 35. Draw a free body diagram to illustrate a wheelbarrow carrying an object of weight 500N. Assume that the weight of the wheelbarrow is negligible and that the object’s weight acts on the centre of the wheelbarrow. What is the minimum upward force required at the handles (at the opposite end of the pivot) that is needed to support this weight?
  36. 36. How does a balancing toy work?
  37. 37. ______________________________________________________________________________
  38. 38. ______________________________________________________________________________
  39. 39. ______________________________________________________________________________

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