Types of structures
What are the two categories of structures?
Natural and Man-made
concrete, steel, glass are what kind of materials?
Manufactured materials
Why do athletes require structures that contain?
For protection.
Stone is strong, but ________ , making it difficult to work with.
heavy
What keeps bricks together once it's dry?
Mortar
Structures that enclose.
Diamond, steel, and concrete have this property.
Hard
What properties do ice-hockey players' equipment require?
soft (padding), hard (face-mask)
Why is wood an easy material to use?
Easy to cut and shape.
Because we have changed its shape to reinforce it.
A plant stem, tree, pillars, lamppost, bench, scaffold
Structures that support
When would we need a material that can bend?
Tires, spring...
What properties do racers' equipment require?
Light (body suit), hard (helmet, knee pads), clear (visor)
What are three types of modern materials?
Steel, concrete and strengthened glass.
What's the difference between reinforced and prestressed concrete?
Reinforced concrete has steel rods inside, and prestressed apply tension to those rods before setting.
Structures that span
What are two materials that are resistant to temperature change?
ceramics and steel
Why should liquid containers not be porous?
Because then their contents would leak out.
Describe the process of clay production, and how best to lay them.
Dig it up, work it, squeeze out water, shaped and baked.
Overlapping.
What are the ingredients of concrete?
cement, sand, water, stones
What are the five simple shapes that make up most structures?
Sheet, cylinder, cube, sphere, cone
Name 4 different natural materials.
wood, stone, cotton and leather.
What are the two main forces all structures must deal with? What happens when there is not equal forces throughout the structure.
Tension + Compression
The structure will fail / break
Which force is concrete strong against? Weak? and how do we help it become stronger?
It is strong against compression, and weak against tension.
We reinforce it with steel bars while its drying.
Sports equipment can also be called _____________
Protective containers