Types of Structures
What is a Structure?
Something made of parts designed to support a load or perform a function.
Which structure spreads forces over a thin surface?
Shell structure
What is a woven or knit material?
Material made by interlacing fibers
What happens to an object's weight if gravity increases, but its mass stays the same?
Its weight increases
What force pulls materials apart?
Tension
A tree and a rock arch are examples of what kind of structure?
Natural structures
Name one example of a frame structure
Bike, Bridge, Crane, Building frame ect.
What is a composite material?
A material made from two or more materials combined for strength
Why is mass measured in kilograms while force is measured in newtons?
Mass measures the amount of matter; force measures the effect of gravity or pushes/ pulls
What force squeezes materials together?
Compression
A bridge and a skyscraper are examples of what type of structure?
Manufactured structures
How does a shell structure support loads differently than a frame structure?
Shell spreads forces across its surface, frame uses connected parts
Why are compisite materials often stronger than the materials they are made from?
The materials combine their strengths and reduce weaknesses
What unit is used to measure force?
Newtons (N)
A bookshelf sags in the middle under heavy books. What force is causing this?
Bending
Which type of structures uses skeleton- like framework
Frame structure
What type of structure is best for a greenhouse and why?
Frame structure, because it allows light through and supports panels
A stanley mug keeps drinks hot for hours. What material properties make this possible?
Strong metal walls and insulation that reduce heat transfer
When an astronaut measures a rock on the moon, do they record mass or weight?
Mass
Why is a mobile joint better tan a fixed joint for a door hinge?
It allows controlled movement
Which structure relies on its solid mass to support loads?
Mass structure
Why would engineers choose a mass structure for a dam?
Its weight and solid material resist strong forces like water pressure
Choose one structure (sweater, roof, or travel mug) and explain how its material choice matches its function.
Example: A roof uses layered materials to provide strength, insulation, and weather protection
Why must engineers consider both live and dead loads when designing a bridge?
To ensure safety under both constant and changing forces
Identify one live load and one dead load on a footbridge.
Live load: Students standing on the bridge
Dead load: Wooden planks or metal beams