2born (2born) wrote,

Что-то интересное по механике

Torques without Rotation: the Right-Angle Lever
Joel A. Shapiro
(Submitted on 20 Jun 2012)
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. Comments: 1 figure, submitted to Am. Journ. of Physics 

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