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6#
發表於 2005-4-5 12:33 AM
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i believe that can be easily explained by newton first law.
/ s. j$ v2 W7 \! [+ gWhen no net force act on a object, the object will travel with constant velocity.
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1 u" l9 C9 ~7 D5 J9 Z' g* [Since the water on the earth will be attracted by gravitational force, it will fell on the ground.# L& b- v6 Z* @4 p" E' m6 u: S; O
: j2 b1 _0 c9 `4 a( ]But in the space, no force is added on the water will u X the ball ,so the water will remain its old velocity(don't move) |
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