Why do things spin?

  • Thread starter piccini9
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  • #1
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Solar systems, planets, spiral galaxies. (Atoms?) What causes objects to spin, rather than just wobble around?
 
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  • #2
russ_watters
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Welcome to PF.

What does "wobble around" mean? If something has a force applied offcenter, it spins because of the uncentered force. I'm not sure quite how else to explain it.
 
  • #3
Nabeshin
Science Advisor
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I share russ's confusion with the term "wobble" but I think the answer to this analogous question might help:

Why do things move in a straight line rather than just curve around?

Of course, the answer to this is that any curving motion requires a force to be acting. The situation is the same for rotational motion.
 
  • #4
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Conservation of angular momentum.
 
  • #5
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Conservation of angular momentum.

Thank you, that makes perfect sense.
 

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