Date: 1999 - 2000
How does Earth maintain its speed of rotation? Why don't it
This was our 4th grade question of the week. I think it has to do with
"relativity" or it will stay in motion until something acts against it.
The earth is actually slowly slowing down every year and due to this
the Earth day is getting longer. However the amount is very small
and was found when the solar year was compared to the atomic clocks
that we have developed.
You're right; it will maintain the same motion until something acts against
it. No need to drag relativity into the problem.
We could slow it down, you know. If everybody on Earth would run Eastward,
the Earth would slow down just the slightest bit. Of course it would speed
back up again as we stopped walking.
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Update: June 2012