In a weightless environment, an object would spin by its
centre of gravity, why does this not happen on earth.
It does- If you were to take a wrench or some other object and locate its CG
then drop it off of a building and photograph it in free fall you would find
that the object spins about its CG during the fall. In other words the path
of the CG would be straight.
Richard E. Barrans Jr., Ph.D.
PG Research Foundation, Darien, Illinois
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Update: June 2012