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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.( k! b( i" Z, y3 R$ T# ]
When no net force act on a object, the object will travel with constant velocity.# ?- X. S& X5 ]
$ u3 ?! e. |" E* ]1 j# \" \- v, n$ r ^1 v+ R# b( X
Since the water on the earth will be attracted by gravitational force, it will fell on the ground.7 Q. Y8 \6 o9 N% p4 y5 [2 J5 I- f
. W" p) c5 v7 d' Y* \( @2 pBut 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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