F=ma vs sum of forces =ma

[Perseverance7779311]

hey guys, could you please tell how one would know to use the f=ma equation vs the sum of forces =ma....thank you!

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[Teleologist]

The first equation you noted is at best incomplete and at worst flat out wrong.

So they're only one correct equation among the two you noted.

It should be easy now figuring out which one to use.

 

[Perseverance7779311]

thank you.