|Oct2-10, 01:18 AM||#1|
Finding the Resultant force
Ok so I have something like this...not drawn to scale
I can see that with the law of cos I can get 49N
However...with this other method where you set Sum of F=0
I get 55N
Is there soemthing wrong? I'm pretty sure the first answer is correct...but I don't know why this one isnt...
|Oct2-10, 02:51 AM||#2|
The second one looks right, so I'm guessing the first is wrong.... what do you mean using the law of cos?
I think the best way is to just break down each force vector into its x and y components; add those to find the resultant, then use the Pythagorean theorem to find the magnitude of the resultant (that's effectively what you did with your second method).
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