a) State the principle of moments b) A see-saw consists of a uniform beam freely pivoted at its centre. Two children of weights 360 N and 240 N are sitting on either side of the see-saw so that it is kept in equilibrium. How far from the pivot is the heavier child sat when the lighter child is at a distance of 1.8 m c) A uniform beam of length 10.0 m and weight 300 N rests on two posts each positioned at a distance of 2.0 m from either end. A child of weight 360 Stands 4.0 m from one end of the beam which is in equilibrium. i) draw a free-body diagram to show the forces acting on the beam ii) calculate the size of each force acting on the beam where it touches each post.

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