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# 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. ______________________________________________________________________________