动量
拉经典力学里，动量（momentum）是物体个质量搭速度个乘积。例如，一辆快速移动个重型卡车拥有交关大个动量。若要让箇重型卡车从零速度加速到移动速度，各需要使到交关大个作用力；若要让重型卡车从移动速度减速到零，各也需要使到交关大个作用力；若卡车轻一点或移动速度慢一点，则渠个动量也会小一点。
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