STABILITY
MAN MADE STRUCTURES
SHEAR
These forces act across a material; one part of the element slides over the other. A good example is when we cut paper with a pair of scissors. The scissors produce a shear force in the paper bigger than it can withstand and one part completely slides over the other until they separate.
Structure ability to stay in its original position, without falling over, when a load acts on it. It is related with the center of gravity which is the point where all the forces acting on the object intersect. It is known as the balancing point.
They are all structures made by humans. Including buildings, bridges, pyramids, cars, monuments, machines and a lot of objects we normally use.
Is a building that is empty from inside, these shell elements are typically curved and assembled into a large structure, they are lightweight constructions using shell elements. Examples include cars, curved buildings, eggs, etc.
These structures are formed by columns and beams that act as supporting elements. Examples are all the ordinary houses.
This is the force that stretches an element. Tensional forces normally pull an element from its ends.