ZIMSEC O Level Combined Science Notes:Structures and construction materials
- A structure is a combination of pieces fixed together so that it is self-supporting and able to support a load
- Examples of structures are:
- bridges, houses, cranes, aeroplanes, door frames, pylons, scaffolding, cabinets, cupboards, chest of drawers, benchs, tables, beds, chairs, fridges, window frame etc
- Materials used to make a structure are carefully chosen based on their properties
- The materials need to be tough i.e. crack resistant
- Rather than strong and stiff
- Materials such as metals, timbers, nylon, polythene, fibre glass, bones and rope are tough
- Other materials such as bricks, cement, Bakelite, and glass are brittle and crack easily
- Materials such as pottery might have the same tensile strength as tin but they will shatter if they fall
- An engineer needs to consider the purpose of the structure and determine which materials are best suited for his/her needs in each case.
- In most cases structures are built using a combination of various materials
- Forces acting on a certain part of the structure, cost and durability are some of the factors that are considered
To access more topics go to the Combined Science Notes page
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