Finding force coordinates when AB and CD are parallel

[ktiniatros]

Hi,

I got a little rusty in the basics.. Need to compute the following force f.

I know the coordinates of A, B and C. Segments AB and CD are parallel. So I need to find to compute the coordinates D of the force f.PS: Don't mind of the size of the square, where the force is applied. I consider it as a spot, I don't care if it has size.

 

[ktiniatros]

OK, I found it. I am just writing it here for future reference for whoever has the same questrion..

Let's say that x and y are the coordinates of D. Then with some x, the y will be slope of AB multiplied by x. Or the tangent of the angle θ that AB makes with x-axis multiplied with x. So, in order to have such a force, you need a couple of (x,tan(θ)*x). You can set the value of x as big as you force f norm want to be.