Question

A rod ab is 8 m long and has got a weight of 10 kg at

a. The fulcrum is 3 m away from

b. Calculate the load at b, if the rod is in balanced condition

Answer 1

Given :

The length of rod = 8 m .

A weight of 10 kg is put at A.

Fulcrum is 3 m away from B .

Let the weight of load at B be x .

Distance of A from fulcrum = 8 m - 3 m

                                             = 5 m

By principle of moments :

Sum of clockwise moments = sum of anti-clockwise moments .

Hence we can write that :

5 m × 10 kg = x × 3 m

= > 50 kg m = 3 x m

= > 3 x = 50 kg

= > x = 50/3 kg

= > x = 16.666 kg

= > x = 16.67 kg

ANSWER :

The load at B would be 16.67 kg

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