Newton says F = ma, so to make it a useful result of this problem, we know the mass of this guy.

牛顿指出 F = ma,这对于解决这个问题很有用,我们知道这个物体的质量

耶鲁公开课 - 基础物理课程节选

For this guy, F = ma will be 10 - f = 3a.

对这个物体,F = ma 就是 10 - f = 3a

耶鲁公开课 - 基础物理课程节选

The only force acting on this guy is this little f.

这个物体只受一个力的作用,也就是 f

耶鲁公开课 - 基础物理课程节选

Moghadam and CEO Private Capital Guy F.

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