Physics
The diagram shows a uniform bar supported at the middle point O. A weight of 40 gf is placed at a distance 40cm to the left of the point O. How can you balance the bar with a weight of 80 gf?
Force
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Answer
From the given figure we can see that,
Anticlockwise moment = 40 gf × 40 cm
Clockwise moment = 80 gf × d cm
As we know, the principle of moments states that
Anticlockwise moment = Clockwise moment.
Therefore the bar will be in balanced position if weight of 80gf is placed at a point of 20cm to the right of O.
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