This weekend i was at dinner at my grandmas house and trying to figure out what i was going to write my physics journal about when i realized i was sitting down and thats physics! I weigh 105 pounds so the force going down is 105 lbs. The chair counters my weight exactly so that i can sit. The force the chair exerts is called the normal. If the force i exert on the chair is too much the chair would collapse. My net force is 0 because the upward and downward forces are the same (equal). When all the forces are equal the object is in equilibrium. In this picture i am at equilibrium.