Questions on Moments
Q7.The diagram shows the girl and her father on a see-saw.
(i) Calculate the moment of the girl. Show clearly how you work out your answer.
Moment = Fd
Moment = 240 × 1.5 
Moment = 360 Nm
(3 marks)
(ii) What must her father do to increase his moment?
Move towards the left or towards his end or the see-saw or move away from the centre / pivot / axis (of rotation) or move away from the girl / the child / his daughter
(1 mark)
(b) Five people take it in turns to sit on a see-saw.
The table gives the weight of each person.
| Person |
weight/ N |
| Jack |
510 |
| Ellie |
540 |
| Rosie |
490 |
| Maggy |
540 |
| Andy |
560 |
(a) Andy sits at one end, but there is nobody on the other end.
In which direction does his end of the see-saw move?
His end will move down (or anticlockwise)
(1 mark)
(b) Which two people in the table above could make the see-saw balance?
Ellie and Maggie
(1 mark)
(c) Rosie sits on end A, and Jack sits on end B.
They lift their feet. Describe what happens to each end of the see-saw.
Jack is heavier than Rosie therefore his end (end B) will go down and her end (end A) will go up.
(1 mark)
(d) Ellie sits on end A, and another of the group sits on end B. Ellie's end stays down. Who could be on end B?
Jack or Rosie
(1 mark)
(Total 8 marks)
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