EXERCISES OF UNIT 5

Page 92

1.- Mass: Walls, dams, etc.                                    Truss: Include cranes, electricity pylons, etc.
     Frame: Building, etc.                                        Suspended: Suspended bridges, tents, marquees, etc.

2.- Electricity pylons
 

Page 93

3.- a) Force                                                           b) Strength

6.- The shell of a turtle is like a frame structure, it´s shape is of the half of a sphere, it´s made of bones and it will resist a withstand.

Page 94

7.- A rope with a weight hanging off it: Tension               A man pushing a cabinet: Compression

     Tighening a screw: Torsion                                            Cutting our fingernails: Shear
 
9.- The rubber band is made of pastic, it´s very elastic and it isn´t rigid at all.

Page 95

11.- Rigid:  Brick                                                    Deformable:  Clay
       Elastic:  Rubber band                                      Plastic:  Wrapping


12.- Plastic: Empty drinks and clay.

       Elastic: Balloon and catapult.
       Rigid: Window frame and door.








Frame structure:

Mass Structure: