Questions on Moments
Q7.The diagram shows the girl and her father on a see-saw.
![](../../KS4/moments/seesaw.png)
(i) Calculate the moment of the girl. Show clearly how you work out your answer.
Moment = Fd
Moment = 240 × 1.5 ![](../../../graphics/symbols/nuclides/ticksmall.png)
Moment = 360
Nm ![](../../../graphics/symbols/nuclides/ticksmall.png)
(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 ![](../../../graphics/symbols/nuclides/ticksmall.png)
(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.
![](seesaw1.png)
In which direction does his end of the see-saw move?
His end will move down (or anticlockwise) ![](../../../graphics/symbols/nuclides/ticksmall.png)
(1 mark)
(b) Which two people in the table above could make the see-saw balance?
Ellie and Maggie ![](../../../graphics/symbols/nuclides/ticksmall.png)
(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.
![](seesaw2.png)
Jack is heavier than Rosie therefore his end (end B) will go down and her end (end A) will go up. ![](../../../graphics/symbols/nuclides/ticksmall.png)
(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?
![](seesaw3.png)
Jack or Rosie ![](../../../graphics/symbols/nuclides/ticksmall.png)
(1 mark)
(Total 8 marks)