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撞擊

物理學裏,假若兩個物體相互接觸,造成能量動量的改變與傳輸,則稱這兩個物體互相碰撞。假若,碰撞的時間很小,而互相作用的力很大,則稱為撞擊。在這撞擊過程中,最初的接觸點叫做彈著點。經過彈著點,垂直於兩個物體之間的切面,就是撞擊線。衝擊可以分成對心撞擊偏心撞擊。假若,兩個物體的質心都在撞擊線上,則稱為對心撞擊;其他的衝擊都稱為偏心撞擊。對心撞擊又分成兩類:當兩個物體的速度向量與撞擊線在同一條線上時,則稱為正向對心撞擊;不然,則稱為斜向對心撞擊

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撞擊
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