Force — Question 17

(i) Moment of force = Fr

Substituting the values of F and r we get,

$10gf \times 50cm = 500gfcm$

(ii) In order to make the rule horizontal by applying least force distance has to be max as moment of force will remain same.

So,

$F = \dfrac{500}{100} = 5gf$

Therefore, a force of 5 gf upwards at 100 cm can balance the rule.