Zusammenfassung der Ressource
measuring metaral
- Properties of materials
- Different materials behave in different
ways. They have different properties
- Solid materials
- Different materials behave in
different ways. They have
different properties.
- strength in tension (when pulled)
- melting point
- strength in
compression (when
pushed)
- stiffness
- hardness
- density.
- Plastics, rubbers and
fibres
- Many products that we use are made
using plastics eg polythene , rubbers
and fibres such as cotton. The
suitability of a material to a particular
job
- washing-up bowl may be made from the
plastic polythene, because this material is
waterproof and can be melted and
reformed into the desired shape
- a bicycle tyre is made from
rubber because it needs to be
flexible and tough
- a pair of tights may be made
from nylon fibres because
these are flexible and elastic
- Effectiveness and durability
- A pair of shoes made with leather
uppers and a rubber sole would be
most effective and durable:
- leather is waterproof and flexible; it can
also be dyed in a range of colours, and
can be given a shiny, polished surface
- rubber is also waterproof and flexible;
it is very hard-wearing, and will not slip
easily when in contact with the ground.
- The properties of these materials make
them suitable for the product. Shoes
made with leather uppers and rubber
soles can carry out their job effectiv
- Variables
- In this investigation there are several
factors, also called variables, which may
affect the outcome. These include the:
- type of rubber
- width of rubber
- thickness of rubber
- length of rubber
- temperature.