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### Author Topic: Sum of Forces  (Read 2285 times)

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#### vidam • Supreme Robot
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• Robotronics.org ##### Sum of Forces
« on: January 23, 2008, 11:09:23 AM »
Along the y axis at 90 degrees I have a force of 1708.51 N. Suppose I want to find the Force in the x direction at an angle of 45 degrees and the Force vector in the y direction at the same angle.

Fx = F * cos (45) = 1708.51 * cos (45) = 1208.9 N
Fy = F * sin (45)  = 1708.51 * sin ( 45) = 1208.9 N

I noticed that F = Fx + Fy = 2416 N. This does not add up to my original Force magnitude of 1708.51. Can someone explain to me why this happens?

-Melanie

#### vidam • Supreme Robot
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• Robotronics.org ##### Re: Sum of Forces
« Reply #1 on: January 23, 2008, 11:13:42 AM »
Never mind, I found the answer to my question. I had forgotten about using pythagorean theorem

hypotenuse = sqr_root(b*b + c*c)
« Last Edit: January 23, 2008, 03:30:16 PM by vidam »

#### izaktj

• Robot Overlord
•    • Posts: 216
• Helpful? 0 ##### Re: Sum of Forces
« Reply #2 on: January 23, 2008, 03:19:20 PM »
Ow I wanted to tell you the answer x3
Just yesterday we reviewed force diagram (vectors).

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