The angle θ is the generalized coordinate that defines the configuration of the lever, therefore using the formula above for forces applied to a one degree-of-freedom mechanism, the generalized force is given by Q = F A ⋅ ⋅ ∂ ∂ v A ∂ ∂ θ θ ˙ ˙ − − F B ⋅ ⋅ ∂ ∂ v B ∂ ∂ θ θ ˙ ˙ = a ( F A ⋅ ⋅ e A ⊥ ⊥ ) − − b ( F B ⋅ ⋅ e B ⊥ ⊥ ) .