1.Structures :definition and types

STRUCTURES

A structure is a collection of elements arranged in an optimum way to support a body or an object. 

     Photo of a famous  structure in Spain:

    Types of stuctures:

Mass structures. These are solid, heavy and very sturdy strucutes. Examples include walls, dams,etc.

Frame structures. These structures are formen by columns and beams that act as supporting elements. One example might be the structure of a building.

Truss structures. These structure are composed of bars that form triangles. They are lightweight and sturdy. Examples  include cranes, electricity pylons, etc.

Suspended structure. These are held in place by cables and suspenders attached to sturdy supports. Examples include suspension bridges, tent, marquees, etc.

- A force is an influence that can deform a body or change its movement,or produce motion in a body rest.

-Stresses are the physical demands that a body or object must withstand when one or more external forces are applied to it