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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.

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.

(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