Other Force problem

1. Nov 23, 2013

k31453

Other Force problem !!!

1. The problem statement, all variables and given/known data

Two forces act on a 3.1 kg mass, which undergoes acceleration a = 0.88 i - 0.28 j m/s2. If one of the forces is F1 = - 1.5 i - 3.0 j N, what is the other force?

2. Relevant equations
I don't know how to visualize this !!!!

3. The attempt at a solution

I know two component add to Force but I cant visualize. I know vectors as :
F2 = ( 0.88 i - 0.28 j) * 3.1 which is 4th quadrant and F1 will be 3rd quadrant but how i can visualize it !!

2. Nov 23, 2013

BruceW

yep. One force is a vector which goes to the third quandrant, and the total vector is in the fourth quadrant. So how to get from the third quadrant to the fourth quadrant? maybe it is simpler than you are thinking.

3. Nov 23, 2013

k31453

Ok how do you know thats total vector ?

4. Nov 23, 2013

BruceW

well, you got it by multiplying mass times acceleration, so by definition, that is the total force vector.

5. Nov 23, 2013

k31453

Cause... thats where i was gettin tricked.

6. Nov 23, 2013

SteamKing

Staff Emeritus
Well, did you try making a sketch?