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Question

Figure shows a uniform metre rule placed on a fulcrum at its mid-point O and having a weight 40gf at the 10cm mark and a weight of 20gf at the 90cm mark. Is the metre rule in equilibrium? If not, how will the rule turn?

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A
yes. The rule will not turn
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B
yes. The rule will turn anticlockwise
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C
No. The rule will turn anticlockwise
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D
No. The rule will turn clockwise
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Solution

The correct option is D No. The rule will turn anticlockwise
Let us find individual moments of force.Considering 40 gf and 10 cm mark then 40 gf is at a distance of 40 cm from point O. we get moment of force is equal to 4040=1600gfcm.
Now let us consider 20 gf and 90 cm mark then 20 gf is at a distance of 40 cm to the right to O. We get moment of force as 2040=800gfcm. Both are not equal hence not in equilibrium.As 1600 gf cm is in anticlockwise in direction it turns in that anti clockwise direction.

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