structures

structures

1. forces

   • when you press your rubber the force you apply causes its shape to change.
   • when you push your book you apply causes the book to move it
   • If you drop your rubber and your pencil so that they hit each other, the direction of their movements change.
   • but if a classmate hold it, another force cou tracts your force and prevents the book from moving.

2. a structure is a set of elements in a body that are intented to resist the effects of the forces that act on it.

   • natural
   • artificial

3. a structure prevents a body from breaking or becoming too deformed

4. loads

   • a load is the force that acts on a structure.

5. stresses

   • stress are thebeffects that loads cause in a structure
     • traction
       • load trends to stretch the structure
     • compressio
       • load tends to flatten or compress the structure.
     • torsion
       • load tends to twist the structure
     • shear
       • load tens to shear the structure
     • bending
       • load tends to bend the structure

6. structural conditions

   • stability
     • the capacity of structure to remain upright and not tip over.
   • rigidity
     • the capacity of a structure to become deformed but the deformation must not prevent it form fulfilling its funtion.
   • resistance
     • the capacity ofa structure to bear the stresses without breaking.