GCSE Questions: Moments and Centre of Gravity


(a) The diagram shows a child's mobile. The mobile hangs from point P on the ceiling of the child's bedroom.

(i) Mark the position of the centre of mass of the mobile by drawing a letter X on a sketch of the diagram. Do this so that the centre of the X marks the centre of mass of the mobile.

(1 mark)

(ii) Explain why you have chosen this position for your letter X.

(2 marks)

(b) The diagram shows a device which helps to prevent a ladder from falling over.

Use the term 'centre of mass' to explain why the ladder, in the situation shown, is unlikely to topple over. You may sketch a diagram to illustrate your explanation.

(3 marks)

(Total 6 marks)