Recent content by MarcoAurelio

\sum\vec{F} is intended to be the net force (this is the sum of all forces acting on an object). However I have read that such sum equals to the product of the mass of the object and the acceleration that undergoes, but it resulted confusing to me that I read that \textit{m}\vec{a} doesn't...

Thanks people this really helped a lot.

Thanks, also one more question, so according to this, when I'm calculating weight (which is the product of mass and gravitational acceleration), should I consider acceleration as negative since it's pointing down, or shouldn't I?

That's what I wanted to hear! Thanks Ethan0718, seriously my Teacher didn't explain this topic with enough seriousness, since was extremely confusing the sign.

Found this video LOOK, I FOUND THIS VIDEO, THE INSTRUCTOR SAYS HE USES g as POSITIVE since he is considering the vectors to be referenced to such motion, what I'm saying comes from this comment the instructor made: "You can pick any direction you want to be positive, up or down. In that...

And when the object is thrown upwards the positive velocity is decreasing and therefore acceleration is still negative?

Ah, so when the object goes down it's velocity is increasing negatively and therefore acceleration is negative?

So acceleration of gravity is negative regardless the velocity of the object?

Yeah, but I'm still confused, I reviewed rules for sign of acceleration, so if velocity is increasing in the negative y direction, shouldn't acceleration be positive since velocity is increasing?

I have a question, according to rules for the sign of x and y-acceleration; when I should use the negative sign for gravity (g) in a problem, because it's confusing since I've seen that according to my textbook when an object is free falling g is negative (therefore acceleration is -9.8 ms^-2)...