Weight of an object
2008-04-08 1:27 am
Weight of an object應該係the force acting on the object by the ground定係the force acting on the ground by the object呢??? 佢定normal reaction算唔算action-reaction pair?
回答 (2)
2008-04-08 2:49 am
✔ 最佳答案
一件物件承受的重力是地球（地球引力）拉動該物件的力，與地面無任何關係（有關的話豈不是你跳起後係進入無重狀態！？）。這種力隨著物件質量的改變會有著相應的變化（F=mg)。假設該物件被地面承托著，由於重力和反作用力以相同數值而相反方向出現，所以重力和反作用力是action-reaction pair
但若果該物件並非被地面承托著，則重力和地面提供的反作用力並不能成為action-reaction pair
2008-04-08 1:48 am
Weight of an object應該係the force acting on the object by the ground.
The weight and the normal reaction 算係 action-reaction pair.
The weight and the normal reaction 算係 action-reaction pair.
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