Structures & Materials
Natural
Provide an Example of both a dead load and a live load in this classroom.
Dead load - ceiling, floor, counters
Live load - desks, books, students, etc
Stepping on a pop can is an example of which type of structural failure?
Bending or Buckling
Provide an example where frictional forces helps with the strength of a structure.
- nails in wood frame
- brick wall
Another word for a structures beauty.
Aesthetics
Concrete reinforces with metal beams is an example of what type of material
Composite
Bending is a combination of which two internal forces?
Compression & Tension
When a garden hose loses its shape and gets knotted from being twisted, which type of structural failure is this?
Torsion Failure
What is one way structures are designed to withstand forces and provide an example.
- distribute load
- direct forces along angled components
- shape parts to withstand specific types of forces
Melting two pieces of metal together is called
Welding
Categorize these structures as either Frame, Mass, or Shell.
- Juice Box
- Bicycle
- Snowball
Juice box (shell)
Bicycle (frame)
Snowball (mass)
What is the difference between mass and weight? what are their units?
Mass is the amount of matter in an object. (kg, kilograms)
Weight is the amount of force with gravity applies to an object. (N, Newtons)
"Shear Failure" is caused by which type of internal force.
Compression
The centre stone in a arched structure is called...
The Keystone
Bending or tearing a material by pressing different parts in opposite directions is which type of internal force?
Shear Force
Provide an example of a mobile joint in this classroom.
door hinge, etc.
With a partner, act out a tension force.
Various possibilities
- pull away from each other
Bending and twisting a paper clip till it breaks is an example of _______ ________
Metal Fatigue
A bridge with multiple braces and beams adding angled supports is
A Cantilever Bridge
A specific point where all of the mass of a structure is evenly distributed around is...
Center of Gravity
When a structure is designed withstand more loads or forces than would typically be expected, this is called the structures ______________.
Margin of Safety
If a person has a mass of 10 kg, what is their weight on earth, and what would their weight on the moon be if the moon is 1/6th the size of earth?
Weight on Earth = 100 Newtons
Weight on Moon = 17 Newtons
Provide an example of where structural failure is beneficial to the safety of a person, and state which type of structural failure it is.
Ex. Front bumper buckling on collision to reduce severity of crash.
Various answers acceptable.
what are two things which will increase an objects stability?
1) when they rest on a large area
2) have most of their mass close to the ground
Tensile strength is the amount of _________ an object can withstand before failing.
Tension or stretch