What are the 3 things we should consider when designing for strength
strong shapes
arches, beams, columns and braces
using friction (fasteners, mass/weight)
100
What is friction
Friction is the force that results when the surface of one object moves against the surface of another object.
200
Three things force depends on
how strong the force is
the direction of the force
where the force is being applied
200
What is another word to describe internal forces
stresses
200
Draw what 'bending' looks like and two forces that are involved in it.
200
What are the three things we should consider when designing for stability
weight low to the ground, wide base
symmetry
firm foundation
200
What is footing
Footings under the foundation help spread the weight of the structure (wide base). They also increase the friction with the ground.
300
What is weight
Weight is the downward push of your body. It is caused by the downward pull of gravity against your body.
300
Give 3 examples of external forces
wind
gravity
earthquakes
people
300
What is failure?
Failure is when a structure is permanently damaged by forces acting on it.
300
What is the strongest shape
triangle
300
An egg has this shape: it is strong but not very stable.
What is a dome
400
What is mass?
Mass is a measure of the amount of matter in your body. Mass measure how many particles your body is made of.
400
Give 3 examples to describe internal forces
compression
tension
bending
400
What is the difference between deformation and collapse?
Deformation is when a structure is permanently damaged by a change in shape. It may maintain its function. It may be repairable.
Collapse is when a structure no longer maintains any part of its original shape and it can no longer maintain its function.
400
Draw an arch, beam, column, and brace
400
Both sides of your chair are the same size and shape to create balanced forces.
What is symmetry
500
Differences between Mass and Weight
weight can change depending upon location
weight is measured in Newtons (N)
weight is measured using a spring scale
mass does not depend upon location
mass is measured in Kilograms (Kg)
mass is measured using a balance
500
What is the difference between static load and dynamic load?
A static load is the weight of a structure upon itself. It is caused by gravity. It is an external force because gravity acts from outside the structure.
It is permanent.
 Examples:
A dynamic load is a force that acts in or on a structure but is not part of the structure.
It is temporary.
500
Draw shear, buckle, torsion, and snapping failures
500
What are some important properties of materials that should be considered when building a structure?
brittle or flexible
hard or soft
resistance to heat
resistance to water
500
You can put a diagonal piece across the inside of a rectangular shape to help strengthen it.