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Discussion and Debate
Discussion and Debate
Physical & Life Sciences
Is the absolute center of a spinning object moving or stationary?
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<blockquote data-quote="essentialsaltes" data-source="post: 76348761" data-attributes="member: 294566"><p>This is largely my take as well. If we're talking about a geometric point, motion doesn't have much meaning. If we mean a <em>chunk</em> of stuff, some of the bits of the chunk will be moving.</p><p></p><p>Possibly a better way to think about it is that a small symmetrical mass 'at the center' (or along the axis of rotation) has no <strong>linear</strong> momentum, but it would have <strong>angular</strong> momentum due to the spin. </p><p></p><p>If you stand at the equator, you're moving 1000 miles per hour to the east (with respect to the moon, say).</p><p></p><p>If you're standing at the north pole, you're not going east at all, but you're slowly rotating in place once a day.</p></blockquote><p></p>
[QUOTE="essentialsaltes, post: 76348761, member: 294566"] This is largely my take as well. If we're talking about a geometric point, motion doesn't have much meaning. If we mean a [I]chunk[/I] of stuff, some of the bits of the chunk will be moving. Possibly a better way to think about it is that a small symmetrical mass 'at the center' (or along the axis of rotation) has no [B]linear[/B] momentum, but it would have [B]angular[/B] momentum due to the spin. If you stand at the equator, you're moving 1000 miles per hour to the east (with respect to the moon, say). If you're standing at the north pole, you're not going east at all, but you're slowly rotating in place once a day. [/QUOTE]
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Physical & Life Sciences
Is the absolute center of a spinning object moving or stationary?
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