Recent content by Skittlz

Thanks for the help :D

Ah I see now, so what i do is: Find each unit vector then multiply by the force across it e.g. unit vector of AB = 4 x (4/√20, 0, 2/√20) Then do the same for the other two and then add the forces to find the resultant force.

I know not to multiply by 4 as that just makes the vector larger i.e 4 times larger in this case. But 4N is the force across the vector which would mean |AB| = 4 right? So given that AB = (4,0,2) - (by subtracting) the magnitude would be srt20 right? but we are told that it is 4 so do we...

I see, thanks! One thing I still don't understand. what am I supposed to do with the given forces?

By adding I get AB = (-2,4,-4) AC = (5,3,-5) and AD = (3,1,2) would I then add these 3 vectors to get the direction and then use Pythagoras to find the magnitude? Edit: this is wrong.

Homework Statement The vertices of a quadrilateral are A(1,2,-1) B(-3,2,-3) C(4,1,-4) and D(2,-1,3). At A forces of magnitude 4, 5 and 4 are Newtons act along AB, AC, and AD respectively. Find the resultant force. Looking for more of a hint than an answer. Any help would be...