In otherwords, the vertical component of its linear momentum remains zero, since there is no resultant vertical force. 換句話說，因為沒有豎直方向的合力，所以線動量的豎直方向仍為零。
In motions of rotation angular momentum appears in much the same way as linear momentum appears in motion of translation. 在旋轉運動中的角動量產生的方式與平移運動中的線動量的產生是基本相似的。
We are interested in determining the amount of linear momentum delivered to the electron by the field. 我們對確定場傳遞給電子的線性動量的大小感興趣。
The principle that the total linear momentum in a closed system is constant and is not affected by processes occurring inside the system. 一個關閉系統中匯流排性動量保持不變且不被系統內部過程影響的原理。
