Flashcards
Design and technology gcse
Flashcards do conjunto (27)
- 1What is tension?A stretching force
- 2What is torsion?A twisting force
- 3What is compression?A pushing force
- 4What is a shear force?Forces that act in opposite directions but aren't aligned
- 5What is a bending force?A force that cause materials to bend under a pressure
- 6LaminationWhen layers are glued together to increase strength and rigidity
- 7Describe strengthA materials ability to withstand a force without breaking.
- 8Describe hardnessA materials ability to withstand scratching and abrasion
- 9ToughnessIf a material is tough it is hard to break or snap
- 10ElasticityA material's ability to stretch and then return to it's original shape
- 11MalleabilityHow easily a material can be bent or shaped
- 12DuctilityHow easily a material can be drawn into wires
- 13Electrical conductivityHow easily can a material pass on an electrical current
- 14Thermal conductivityCan a material easily pass on heat?
- 15Materials with a high fusibility have a --- melting point.LOW. They only need a small amount of heat to convert them to a liquid and make them fuse. Solder has a high fusibility.
- 16DensityHow much mass is in each unit square.
- 17AbsorbencyMaterials that have a high absorbency are good a soaking up water
- 18Non-metals are...More brittle; less dense; poor conductors; solids at room temperature and dull looking
- 19Metals are...Good conductors; strong; malleable and not very fusible.
- 20Alloys are...a mixture of two more more metals that is developed to have a specific set of characteristics.
- 21Planed Square Edge timber (PSE)Timber that's had it's rough edges taken off so it has smooth corners.
- 22Rough sawn timberIt's not smoothed after it's cut and it's cheaper.
- 23MouldingsTimber with various cross sections, used for skirting boards.
- 24What stock forms are manufactured boards available in?2440 x 1220 mm sheets with thickness between 4-18 mm
- 25Why are metals available in a wide range of stock forms?They can be difficult to convert or shape.
- 26What stock forms can metals be found in. (Name 5).Sheet, strip, bar, rod, tube, angle, U-shaped channel or I-shaped girder.
- 27Name 5 stock forms of polymersSheet, tube, rod, foam, film, granules or powder.
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- Melia Greene
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