Question

The diagram below shows a uniform bar supported at the middle point o. A weight of 40 gf is placed at distance 40cm to the left of point o . How can you balance the bar with a weight of 80 gf?

Answer 1

Anticlockwise moment = 40gf × 40 cm

Clockwise moment = 80 gf × d cm

From the principle of moments, anticlockwise moment = Clockwise moment 40 gf × 40 cm = 80 gf × d

So, d = 40gf x 40/80 = 20cm to the righte of point O

Hope this answer will help you.

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