Unformatted text preview: r decreases, vorbit (and v t ) must increase! If r increases, vorbit (and v t ) must decrease. This is just what Kepler observed for the planets! EarthMoon system The total angular momentum = spin angular momentum + orbital angular momentum. The total angular momentum is CONSTANT. To find the spin angular momentum, subdivide the object into small pieces of mass and find the angular momentum for each of the small pieces. Then add up the angular momentum for all of the pieces. The Earth's spin speed is decreasing so its spin angular momentum is DEcreasing. Therefore, the Moon's orbital angular momentum must compensate by INcreasing. It does this by increasing the EarthMoon distance....
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 Fall '10
 EmilyHoward
 Astronomy, Angular Momentum, orbital angular momentum, spin angular momentum

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