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The structures (What is a structure? (How to do a perfect structure: (For…

- - - - Frame structures
        
        Examples
        
        Bicycle
        
        Leaf
        
        Roof frame
        
        Definition
        
        A frame structure consists of different parts. These parts are combined in such a way to make the structure strong. A ladder and a bicycle are good examples of man-made frame structures. Spiderwebs are natural frame structures.
      - Solid or massive structures
        
        Definition
        
        Structures like rocks, bricks and cement poles are solid. They do not consist of different parts with open spaces between them. A stone is natural solid structure and is one piece of materi-al. A brick is a man-made solid structure.
        
        Examples
        
        Stone
        
        Tea spoon
        
        Brick
      - Shell structures
        
        Examples
        
        A rubber tyre
        
        Honeycombs
        
        Eggs
        
        Definition
        
        Most containers used to hold liquids or small solids are shell structures. Examples are coffee, mugs, bowls for peanuts and bags for rice or sugar. The strength of a shell structure is on its outside - in the shell. Chicken eggs and empty ostrich eggs are examples of natural shell structures. Soccer balls or ballons are man-made shell structures.
  - - - Stiffen: to become firm or more difficult to bend.
      - Stabilize: if something stabilizes it becomes fixed or stop changing.
      - Support: you can put things on it and it doesn't fall.
    - - For do a perfect structure we need a good Base
        
        The bottom of something considered as its support
    - - For do a perfect structure we need a point of gravity
        
        The point of gravity is the point of the structure that causes it to withstand it all.
- - - - Dynamic forces are forces that occur due to the motion of the mechanism. e.g. the mechanism traces out a path, and in order to follow that path, parts of the mechanism must accelera.te. Then, since F=ma, there are forces F which are due to the acceleration necessary for the mechanism to complete the motion.
    - - A static force refers to a constant force applied to a stationary object. A static force is too weak to move an object because it is being countered by equally strong opposite forces.
  - - - Flexing or Bending Effort
        
        An element is subjected to a bending stress, when the forces acting on it, they try to bend it. An example ist's the board of a table.
    - - Torsion Effort
        
        An element is subjected to a torsion effort, when the forces acting on it, they try to twist it. Example: a key opening a lock
    - - Compression Effort
        
        An element is subjected to a compressive effort, when the forces acting on it, they tend or try to compress it. An example is the legs of a chair.
    - - Cutting or Sliding Effort
        
        An element is subjected to cutting effort, when the forces acting on it, they try to cut it. Example: a scissor.
    - - Tractoin Effort
        
        An element is subjected to a traction effort, when the forces acting on it, they try to stretch it. An example would be the cable of a crane. Watch out, they will try to stretch it, but in an element of a structure, the forces should never get it, at least visually (with the naket eye). This should happen for all the efforts taht we are going to explain. The forces will try it but they must not get it.