Types of structures
What do we call a structure made by piling materials, like a snow fort or a sandcastle?
Mass structure
What is a force?
A push or a pull on an object
What is a static load?
A load that doesn't change or move
Is a bird's nest a natural or man-made structure?
Natural
What is mass?
The amount of matter in an object
What type of structure uses a skeleton-like frame to support it?
Frame structure
What do we call the force that pulls objects toward the Earth?
Gravity
What is a dynamic load?
A load that moves or changes over time
Is a skyscraper natural or man-made?
Man-made
What is weight?
The force of gravity on an object
What type of structure is hollow and usually made from a curved shape like a dome or shell?
Shell structure
What kind of force pushes materials together?
Compression
Is a person walking across a bridge a static or dynamic load?
Dynamic load
Is a tree a natural or man-made structure?
Natural
What is structural integrity?
The ability of a structure to stay safe and strong
Name two examples of a frame structure.
Examples: house frame, jungle gym, bike frame
What kind of force pulls materials apart?
Tension
What is the main load a bookcase must hold?
The weight of the books (live/static load)
Is a dam built by humans natural or man-made?
Man-made
What is shear?
A force that causes parts to slide past each other
Which type of structure often uses the least material and is shaped for strength and protection?
Shell structure
What do we call the force that causes materials to twist?
Torsion
What kind of load is caused by the weight of the structure itself?
Dead load
Name one structure built by animals and one built by humans.
Animal: ant hill / beaver dam; Human: bridge / house
What makes a structure strong and stable? (2 things)
Strong materials and a good design