Questions on Moments
Q4.
(a) A vase of weight 8 N, with a base of radius 5 cm and height 25 cm is held at an angle as shown in the diagram.
![](vase1.png)
When it is released it falls back on its base. Explain why (in terms of moments).
(2 marks)
(b) The vase is pushed with a force F at the top rim (see diagram on the right). The force is just large enough to make the vase start to tilt.
![](vase2.png)
(i) Calculate the size of the moment opposing the turning by force F.
(2 marks)
(ii) Calculate the size of force F when the vase just starts to tilt
(2 marks)
(iii) If the base of the vase were wider, a larger force would be needed to make the vase start to tilt. Explain why, in terms of moments.
(2 marks)
Total 8 marks