Note that this is an equivalent free body diagram for the purpose of calculating reactions. It is not entirely same as the loading given in the problem. Both the figures are similar in the sense that they will provide same support reactions.
We can write equations of equilibrium for the beam.
Vertical force balance: R1+ R2 = 1000
Moment about B, (1000 × 150) - (R1 × 200) = 0
Solving this, we get R1=750 N and R2 = 250 N.
Beams
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10000 × 0.1=1000 N. By taking moment about the left support, we can find that resultant passes at a distance of 50mm from the left support. For the purpose of calculating the reactions, we can make equivalent free body diagram as shown below: |