Question

14) A boy of weight 20 kgf sits at 2 m from the centre of a see-saw. His sister of weight 30 kgf sits at 1 m from the centre
of the see-saw on the same side At what position should their father of weight 70 kgf sit so as to balance the see-
saw?​

Answer 1

Answer:

From the principle of moments, Anticlockwise moment = Clockwise moment 20 kgf × 2m = 40kgf × d So, d = 20kgf x 2m/40kgf = 1m from the centre on the side opposite to the boy.