U-D 5 STRUCTURES

U-D 5 STRUCTURES

1. structure: collection of elements arranged in an optimum way to suport a body

   • tipes of structure
     • mass
     • frame
     • truss
     • suspended

2. structure of a body:orderly distribution of its esential parts. it gives an object its shape

3. forces, stresses and strengh

   • force. influence that can change a body
   • stresses: phisical demands that a body must withstand when a force is applied
   • strenght: ability of a material to withstand external forces without breaking

4. conditions for strong structures

   • stability: stable equilibriumif it doesn't move if a force is aplied
   • equilibrium: when structureremains stationary
   • rigidity: it doesn't changes the shape if a force is aplied

5. tipes of stress

   • bending: cause by forces that make curve a body
   • torsion: caused by forces that make twist a body
   • shear: caused by two ecual forces in oposite directions that act on linesof actionclose to each other
   • compression: caused by forces acting in oposite directions
   • tension: caused by forces stretching a body