(2)在水平面上:匀速行驶时,f=f;加速行驶时,f-f=ma.
impulse & momentum的定义要熟悉i=ftp=mv那么二者关系:i=ft f=ma
根据牛顿定律有 1s内:f-mgsinα-f=ma 1…① 1s后:-mgsinα-f=ma 2
9694物理竞赛f=ma美本申请敲门砖986995
a∝ f
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