(2)在水平面上:匀速行驶时,f=f;加速行驶时,f-f=ma.
9694物理竞赛f=ma美本申请敲门砖986995
impulse & momentum的定义要熟悉i=ftp=mv那么二者关系:i=ft f=ma
传送带①静止不动,求v(先受力分析再用f=ma,也就是牛二定律,然后2ax=
f合=ma. 这就是牛顿第二定律的公式.
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