The magnitude of the torque can be written using either the component of the force, F⊥ perpendicular to the vector →r, or the lever arm, r⊥, of the force relative to the axis...The magnitude of the torque can be written using either the component of the force, F⊥ perpendicular to the vector →r, or the lever arm, r⊥, of the force relative to the axis of rotation: τ=rFsinϕ=rF⊥=r⊥F where ϕ is the angle between the vectors →r and →F when these are placed “tail to tail”.
