Very curious, how are they always in balance with the different circumstances of tolerance? No matter where you can load and carry heavy loads, keep it. The The The Which greatly talk to me, or have this information.
Mainly to see the theoretical mechanics, basic high school torque balance can explain some, but the three-dimensional space is best from the perspective of the vector to understand.
It is like you eat, soup, bowl why flat end, you say what is the principle of work. I knew the soup would not spill Do not have to study the principle.
Static balance principle, said the details can refer to the engineering materials of theoretical mechanics, elastic mechanics and material mechanics of the basic part.
