Equilibrium forces?

Question

When forces become equilibrium?

Answer 1

That depends: Equilibrium in a body is mantained when its not moving, or it mantains a constant velocity. That means usually no acceleration when you think of a body as a particule in his center of mass, but if you study further on solid bodies equilibrium, it means no rotation as well. So, the sums of forces and torques must be zero
*ΣF = 0
*ΣT = 0
at all times.

Forces create a torque when their line of action does not pass through the center of mass of the body. I'll show you in this image (boy i want those 10 pts. haha), even though i didnt draw them on equilibrium, i just wanted to make a point:

http://img106.imageshack.us/img106/6540/randombodyxr6.jpg

Check this: F2 goes through the center of mass, so the body only moves without any other movement than translation. Now F1 and F3 are acting so the body will rotate in those directions, the torque is T = F x d, where d is the perpendicular distance from the force's action line to the center of mass.

So as a conclusion, if there are many forces acting on a body, they must end up having an equivalent sum of forces equal to zero, and a sum of torques equal to zero, in order for the body to mantain it's estatic or dynamic equilibrium

Answer 2

The sum of all vectors would desire to be 0,yet that's not sufficient.the 2d of the equipment with understand to any factor would desire to be additionally 0. Ex: take 2 forces equivalent and paralel yet no longer on an identical line. The make as much as a pair no longer in equilibrium yet their vector sum is 0

Answer 3

When the vector sum=0. Laying all the force vectors on the body head to tail, you get a closed polygon. The first force vector starts at "0", so then the vector sum ends up at "0".

Answer 4

Forces that is more than one non-zero forces are in equilibrium if they act on the same object and vectorially add to zero.

Answer 5

forces are in equilibrium when the mass they act on does not accelerate. vectorally , they add to zero

Answer 6

Not sure what your question is but equalibrium is the bodies inability to maintain balance. This is caused by ear infections, vertigo or paralysis. The only force applied here is when you should lose your balance and the body falls.

Answer 7

your question is?