Torques without Rotation: the Right-Angle Lever
Joel A. Shapiro
An extended body subject to external forces which exert zero net force and zero total torque in the rest frame, may experience a nonzero torque in another inertial frame, and nonetheless does not rotate. Long known as the Trouton-Noble or right-angle lever paradox, there has been extensive discussion and indeed controversy, but a clear understanding comes from a suitable treatment of angular momentum and simultaneity….
Read more: http://arxiv.org/pdf/1206.4487v1.pdf
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