A uniform rod of length 1 m and mass 4 kg is supported on two knife-edges placed 10 cm from each end. A 60 N weight is suspended at 30 cm from one end. The reactions at the knife edges is
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AB is the rod, 
and 
are the two knife edges. Since the rod is uniform, therefore its weight acts at its centre of gravity G.
Let 
and 
be reactions at the knife edges.
For the translational equilibrium of the rod.
…..(i)
For the rotational equilibrium, takings moments about G, we get
….. (ii)
Adding (i) and (ii), we get
Substituting this value in Eq. (i),
We get 
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