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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.
; l. L7 d/ _0 r0 M( Q8 DWhen no net force act on a object, the object will travel with constant velocity.
! t" n$ O, m' c7 e! e3 S- u% E8 j9 G& s7 g
) U5 @# ? i, Y0 i; R0 gSince the water on the earth will be attracted by gravitational force, it will fell on the ground.
% q. B/ k' K: L7 m: e1 V0 V H5 r5 u% _4 W/ i5 i0 Y
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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