NATURAL SCIENCE 3

NATURAL SCIENCE 3

1. STRENGTHENING MATERIAL

   • Strong materials must be used to make strong structures
   • Folding = bending something over on itself to strengthen
   • Rolling = Make to make cylinder
   • Factors = things that play a role in result
   • Control = Object unchanged
   • Experiment = test where one factor at a time is changed

2. STRUTS & FRAME STRUCTURES

   • Frame Structures = made of diff. parts joined to make frame that holds things up
   • Traingulation = Struts joined in shape of triangle
     • Frame structures can be strengthened with struts. Examples of struts = Roof trusses / Pylons / Cranes/ Bridges / skeletons
   • Indigenous Structures = traditional houses from raw materials
     • Traditional = based on old beliefs/ ways
     • Specifications = something specific about product
     • Constraint = Something that limits product
     • Wig Wam = Cone shaped hut built by Red Indians. With Bark and wood
     • Rondavel = Cylinder shape built by Xhosa. With mixture Clay, Cattle dung & decorated with paint
     • Uguqa= Semi-circle shape built by Zulus. With flexible young trees, branches tied together to make triangles, mats weaved to cover structure
     • Igloo = Beehive shape built Eskimo's. With Ice
     • Matjieshuis = Semi-cricle shape built by Nama. With woven mats, strong tamarisk trees &