Question

A lighter child can balance a heavier child on a see-saw if :

• A. he eats more to gain energy
• B. he moves closer towards the fulcrum
• C. he moves away from the fulcrum
• D. he uses less effort

Answer 1

Answer: (C)

he moves away from the fulcrum

$\text{Solution}:$

1. A heavy child sitting on one side of a see-saw is balanced by a smaller child, whose weight is less than the former, when he sits at a greater distance from the fulcrum or the axis of rotation.

2. Obviously then, the turning effect of a force increases with the increase of its distance from the axis of rotation or fulcrum.

3. More is the force applied, more is the turning effect of the force.

$\text{Hence C is the correct option}$