(2)在水平面上:匀速行驶时,f=f;加速行驶时,f-f=ma.
(1)设沿斜面向上为正方向 根据牛顿定律有 1s内:f-mgsinα-f=ma 1…①
是否存在这样的关系:f=(f-ma)cosα f=(m m)acosα f=(2m m)a
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
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