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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.
5 j6 l6 R3 ?# f% k( DWhen no net force act on a object, the object will travel with constant velocity.+ Z/ Z4 W q& Q; q
; ^$ J: F9 K: ]$ U0 t+ d9 B& V# C7 O$ V7 q& m
Since the water on the earth will be attracted by gravitational force, it will fell on the ground.8 w3 r" S4 G# l0 h* \( @
1 b K1 J' M Y, jBut 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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