| A | B |
|---|
| plastic | organic material that can be formed into different shapes |
| reinforced concrete | strengthened by long metal rods |
| compression stress | occurs when two forces push toward each other |
| thin film | thin layer of one substance applied and bonded to an underlying material |
| electron-sea model | orderly arrangement of positively charged ions surrounded by uniformly distributed outer-level electrons |
| shear stress | opposite and equal forces that change the shape of an object |
| xylem | cells in a plant that transport water throughout the plant |
| insulator | a material that heat and electricity do not pass through easily |
| tensile stress | occurs when an object is lengthened or pulled apart |
| ceramic | dry, clay like material |
| levers | used by Egyptians to construct the stone pyramids |
| cement, sand, small stones | used to make concrete |
| brass, bronze, steel | examples of an alloy |
| hard, resist corrosion, withstand high temperatures without cracking | advantages of ceramics |
| way prestressed concrete is made | stretching steel cables before concrete is poured, then releasing tension on cables after concrete is dry |
| metals | the electron-sea model is used to explain the properties of this |
| the cost | thin film can reduce what in cooling a building |
| being twisted | an object that is undergoing this is under shear stress |
| polyethylene, polypropylene, PVC | examples of plastic |
| triangles used in building designs | spread the force over a wide area and make structure more rigid |
| easy to cut, easy to nail together, renewable resource | advantages of using wood |
| rot, prone to attack by fungus & termites | disadvantages of using wood |
| durable, nonflammable, good insulator of heat & electricity, resistant to corrosion | advantages of using plastics in construction |
