Unit 4 Structures and Forces: topic 1-3 Flashcards
Define Origin.
Where they came from/ where it started.
define natural structure.
found in nature, living, non-living or dead.
define manufactured structure.
made by people/ man-made
define design (form).
How it was built.
What is Mass/Solid structures?
Piling or putting similar materials into a particular shape/design.
what are some examples of mass structures?
Concrete, brick walls, beaver dam, bread, sculptures.
What are some features about mass/solid structures?
- Solid pieces of strong material.
- little/ no space inside.
- very strong
- held in place by weight
What are some advantages and disadvantages of mass/solid structures?
ADVANTAGE: stays together, solid, strong, holds down own mass, removing a section will not ruin it.
DISADVANTAGE: Can’t be transported, it could contract/expand, very heavy, hard to build, ground could buckle underneath.
What is Frame structures?
A skeleton of materials that supports the weight of other parts.
What are some examples of Frame structures?
Ladder, snow shoes, spiderwebs, wheelchair, a fence.
What are some features about Frame structures?
-Rigid (does not bend)
-parts fastened together
-strength from the pieces fit together
-empty space inside
underneath other materials
What are some advantages and disadvantages of Frame structures.
ADVANTAGES: strong, inexpensive, supports other parts, is the important part for aesthetic structure.
DISADVANTAGES: tall frames are unstable, one missing piece can affect strength, needs to be anchored, hard to make.
What is Shell structures?
Thin, solid outer layer/ surface with hollow inner area.
What are some examples of shell structures?
parachute, milk carton, balloon, soccer ball, igloo.
What are some features about shell structures?
- One continuous piece of material
- no internal frame
- lighter than solid structures
- stronger than frame structures
- uses very little materials
