FT=MV FT：冲量 MV：动量 F：物体所受的力 T:力所持续的时间 M：物体的质量 V：速度
铰链装在哪个轴，锚点参数就调整哪个轴，
物体绕着哪个轴转动，哪个轴参数调整为1
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注：加了out方法内的值a=10才能传递出来,不加out的话，num的值就为默认值0
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