標題: F.4 Physics Force [打印本頁] 作者: 再訪者 時間: 2009-2-14 17:50 標題: F.4 Physics Force
for a free falling object, its acceleration is 10 ms^-2. By newton's 3nd law, the force exerted by the object on the earth should be equal in magnitude, but why cannot we feel the acceleration of the earth?
