Using Torque. We do have more information We know the plank is not rotating TOT=0 T2 cm M L2 The sum of all torques is zero 14 This is true about any axis Mg we choose Physics 121: Lecture 17, Pg 8Physics 121: Lecture 17, Pg 8 Using Torque... We do have more information: We know the plank is not rotating. TOT = 0 The sum of all torques is zero. This is true about any axis we choose ! L/2 L/4 x cm M T1 T2 Mg y x  = 0