Obtain the integrals of energy and angular momentum when a rigid body rotates about a fixed point O of it under no external forces.
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— translating, the axis of rotation is no longer fixed in space. ... forces act at the center of mass (Figure 21.2). ... The angular momentum about the point S can therefore be .
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The pure rotational motion: The rigid body in such a motion rotates about a fixed axis that is perpendicular to a fixed plane. In other words, the axis is fixed and does not move or change its direction relative to an inertial frame of reference.
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