Question

A uniform metre rule of weight 10gf is pivoted at its 0 mark. how can it be made horizontal by applying a least force?​

Answer 1

Answer:

To apply the least force we obviously have to make the perpendicular distance highest. Hence, the least force should be applied at 100cm mark

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Answer 2

Anticlockwise moment = 10 gf × 50 cm

= 500 gf cm

Anticlockwise moment = Clockwise moment

According to principle of moment

10 gf × 50 cm = W × 100 cm

So, W = (10 gf × 50 cm) / 100 cm

= 5 gf

Rule can be made horizontal by applying a force 5 gf upwards at the 100 cm mark.