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Unformatted text preview: A rigid body moves in rotational motion if every point of the body moves in a circular path with a common axis. This definition clearly applies to a bicycle wheel, due to its circular symmetry. But what about objects without a circular shape? Can they move in rotational motion? We shall show that they can by a figure: Figure %: An arbitrarily shaped object rotating about a fixed axis The figure shows an object with no circular symmetry, rotating 90 o about a fixed point A. Clearly all points on the object move about a fixed axis (the origin of the figure), but do they all move in a circular path? The figure shows the path of an arbitrary point P on the object. As it is rotated 90 o it does move in a circular path. Thus any rigid body rotating about a fixed axis exhibits rotational motion, as the path of all points on the body are circular. Now that we have a clear definition of exactly what rotational motion is, we can define variables that describe rotational motion....
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This note was uploaded on 02/09/2012 for the course PHY PHY2053 taught by Professor Davidjudd during the Fall '10 term at Broward College.
- Fall '10