7005(70日大)一炸彈自600米的高空自由落下,於中途爆裂成兩個等重的碎片,在垂直線上分上、下炸開。如空氣阻力可以不計,炸彈下落後10秒
動量:
一般而言,一個物體的動量指的是這個物體在它運動方向上保持運動的趨勢。
動量守恆定律:
如果物體系受到的合外力為零,則系統內各物體動量的向量和保持不變,系統質心維持原本的運動狀態。
Momentum:
In classical mechanics, momentum is the product of the mass and velocity of an object .
The law of conservation of linear momentum :
This is a fundamental law of nature, and it states that if no external force acts on a closed system of objects, the momentum of the closed system remains constant.
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邱博文 Chiou, Bo-Wen
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