It's true the net force is 0, but it doesn't mean you can ignore it.

所受的合力是 0,但是并不意味着你可以忽略它

耶鲁公开课 - 基础物理课程节选

F = ma is universally true, independent of the nature of the force acting on a body.

= ma 是一条普适定律,与作用在物体上的力的属性无关

耶鲁公开课 - 基础物理课程节选

And in the process making this Party the true force for progressive politics in Britain today.

BBC: NEWS | UK | UK Politics | In full: Cameron speech

As many hardcore gamers are diehard fans of classic MMOs, the lack of compatibility for this genre also inhibits the iPad from becoming a true force in gaming.

FORBES: Why My iPad Will Never Replace My Xbox

It is true that Bernanke can t force banks to lend, but he can compel them to boost the money supply by removing any compensation they receive from keeping the money multiplier in check.

FORBES: Fed's Next Move Will Be To Ease Interest Rates