A uniform rod of length l is placed symmetrically on two walls as shown in figure. The rod is in equilibrium. If N₁ and N₂ are the normal forces exerted by the walls on the rod then:-

Question

G1 Physics · Accepted Answer

Use τ⃗=r⃗×F⃗ and Στ=Iα. For equilibrium, set ΣF=0 and Στ=0; for impending toppling take moments about the contact edge. Substituting the stated dimensions/forces gives N₁ = N₂.