I've searched the forum, and found several topics about adding vectors. This one is not as easy... :-)(adsbygoogle = window.adsbygoogle || []).push({});

Suppose I have an object. There are two forces acting upon it. One is acting on a point at -5,0 and the other at +5, 0. The one at -5,0 has magnitude sqrt(17), pointing up (positive y) 4 units and towards the origin 1 unit. The one at +5,0 is pointing -1,4 also sqrt(17) N.

Now I can add the vectors, and I end up with an 0,8 vector of resultant force. However, where does this resultant force act? In this case it will be on the Y-axis, but where?

When the forces are parallel I can find the resulting point: say 1N (0,1) at -1,0 and 3N (0,3) at 3,0 will result in 4N (0,4) in the origin. But how do I find the resulting point if the forces are not parallel ?

Now, back to my original situation. If I add an 0,-8 force in the origin, the total force will be zero. Total moment as well.

However if that force is tilted, say in the -1,-4 direction, do I get a moment around the origin? I think I do. I think I could model this resulting moment by finding a point where the resulting 8N force acts.

Can someone explain how I can find that point?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Adding forces Again

**Physics Forums | Science Articles, Homework Help, Discussion**