Torsion Pendulum Consider an object suspended by a wire attached at its cm. the wire defines the rotation axis, and the moment of inertia I about this axis is known The wire acts like a rotational spring When this produces a torque that he object is rotated, the wire is 0 twisted T (L opposes the rotation In analogy with a spring, the torque produced is proportional to the displacement: t=-k0 Physics 121: Lecture 22, Pg 10Physics 121: Lecture 22, Pg 10 Torsion Pendulum Consider an object suspended by a wire attached at its CM. The wire defines the rotation axis, and the moment of inertia I about this axis is known. The wire acts like a “rotational spring”. When the object is rotated, the wire is twisted. This produces a torque that opposes the rotation. In analogy with a spring, the torque produced is proportional to the displacement:  = -k I wire  