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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. j$ d$ A: I" l: M2 {( Q5 l. ^
When no net force act on a object, the object will travel with constant velocity./ V i! d6 w5 T) ]7 ?' l
4 ^+ ]) _4 u0 {
4 j9 Z& t; M2 v6 ^" bSince the water on the earth will be attracted by gravitational force, it will fell on the ground.' t# F! i6 Z4 A! x0 q
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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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