Question
A rod of weight w is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The knives are at distance d from each other. The centre of mass of the rod is at distance x from A. The normal reaction on A is
Solution
D.
As the weight w balances the normal reactions.
So,
w= N1 +N2 ----- (i)
Now balancing torque about the COM,
i.e. anti -clockwise momentum= clockwise momentum
