core materials Flashcards
advantages of cotton
cool, absorbent, withstand frequent washing at high temperatures
disadvantages of cotton
creases easily, shrinks, dries slowly
physical properties of cotton
grown on a cotton plant in a ball called a boll
fibres are combed and spun into a yarn
advantages of polyester resin
can be cast with glass fibres to make lightweight and very strong products
can be polished to a high finish
disadvantage of polyester resin
can chip if dropped
uses of polyester resin
boat hulls
sports car bodies
can be cast into decorative objects
properties of polyester resin
brittle, rigid, good electrical and thermal insulator
what type of wood is balsa
hardwood
advantages of balsa wood
lightweight
easy to cut
disadvantage of balsa wood
much too soft and week for most products
uses of balsa wood
model making, primary school products, surf board cores
what type of wood is beech
hardwood
advantages of beech wood
a tough wood
does not crack or splinter easily
hard
disadvantage of beech wood
expensive
not very resistant to moisture
not good for exterior use
uses of beech wood
toys, laminated or solid furniture
advantages of copier paper
takes colour well
good surface for pencils, pens and markers
readily available in lots of colours
disadvantages of copier paper
prone to jamming printer feed mechanisms
properties of copier paper
thin, lightweight, cheap, bleached, smooth uncoated surface
properties of cast iron
brittle, good in compression, magnetic, rusts easily
uses of cast iron
machine parts, brake discs, manhole covers, vices
properties of mild steel
tough, ductile, malleable, magnetic, poor corrosion resistance
uses of mild steel
screws, nails, bolts, car body panels,
properties of aluminium
corrosion resistant, malleable, ductile, easily machined, good heat/electrical conductor, excellent strength to weight ratio, polishes well
uses of aluminium
air craft, foil, drinks cans, engine parts, window frames
describe conductive inks
- contain pigments that allow small currents to flow through even when dry
- used in a pen on any suitable material
- Made with silver, carbon, graphite or other precious metal-coated base material
uses of conductive inks
- drawing working circuits on polyester or paper
- improvising or repairing circuits on printed circuit boards
- printing RFID tags for tickets etc
advantages of conductive inks
- easy to use
- lighter and more economical than traditional circuit boards
- low waste
- ink can be folded, so you can draw a circuit, fold the paper and unfold it to find the circuit still works
what is a pulley
grooved wheel with a belt running in the groove
- used to control how fast something turns
- make lifting things easier
