nst term 2 - properties of materials Flashcards
what are properties
what a material LOOKS like and how I BEHAVES
what does waterproof mean
it does not let water pass through
what does flexible mean
the material can bend easily
what does dent mean
to make a hollow on a surface
what does stiff mean
the material does not bend easily
what does examine mean
to find more out about something
what does absorbent mean
to soak up liquid
How can you test how hard something it?
See how easy it is to scratch, cut or dent it
What are the 5 main properties of materials?
- Hard or Soft
- Stiff or flexible
- Strong or weak
- Light or heavy
- Waterproof or absorbent
what is folding
bending something over on itself to strengthen a sheet of material
what is a factor
things that play a role in the result
what is a control
a object or material were nothing is changed
what is an experiment
a test where only 1 factor is changed at time
What is a fair test?
When we test everything on the same way
What are the two parts that a fair test can/should have?
The CONTROL - where all the factors are kept the same
and the EXPERIMENT - where we change only one factor
what is a bar graph
a diagram that shows information in bars or columns
what are struts
lengths of strong material that are joined to make a strong frame
what is a frame structure
a structure that is made from different parts
What are two ways to strengthen materials?
Folding
Rolling into long thin tubes or struts (circular, triangular or square pillars)
What is a frame structure?
Structures made of different parts that are joined to make a frame that holds things up, to give a shape or to bridge a gap
What is triangulation?
Where struts are joined into the shape of a triangle to make a strong and stable frame. Putting even small triangles into a structure is called triangulation
Where is triangulation used?
In roof trusses, bridges, cranes, pylons, skeletons
What are triangular struts for
To prevent the - sides of a structure from splitting open at a corner joint, and
- sides of a structure from moving closer to together at the corner joints
What are frame structures used for
To hold things up
To give things shape
To bridge a gap between two places
