Technology Grade 8
Term 1
1
Frame Structures
Key concepts for structures:
- Frame structures are made up of severa members.
- Each member of a roof truss performs a particular function in a truss.
- The four different forces that may act on structures are tension, compression, shearand torsion forces.
- Each different force has a different effect on the members of trusses.
- There is a simple method to identify tension and compression forces in members of trusses.
- Trusses need structures that form triangles in order to be rigid.
- Electrical pylons need to include triangular forms (triangulation), so that they can be rigid.
- Cross-bracing in electrical pylons makes them resistant to torsion forces.
- Several very different structures are used to span spaces.
- Structures can fail from a lack of strength (they can fracture), a lack of stiffness or rigidity (they can bend) or a lack of stability (they can fall over).
Term 2
1
Reducing the negative impact of technology
Write a report on reducing the negative impact of plastic bags on society and the environment.
Only click finish once you have completed the report in your notebook.
2
Investigate what paper and cardboard is made of
3
Draw the development of a box
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