Forces and building materials Flashcards
(19 cards)
What is a force?
A force is a push or pull on an object.
What is tension?
Tension is a force that pulls and acts on both sides of and object.
What is compression?
Compression is a force that squeezes an object.
What is shear?
Sher is a force that acts parallel to the surface of an object.
What is bending?
Bending is a force that pushes inwards
What is torsion?
Torsion is a force that twist on both sides.
What is unloaded?
Unloaded is a force that dosen’t do anything.
What are some things to know about wood when building?
- Not always cheap
- Easy to work with
- Strong under tension and compression
- Limited in length by tree height
- Changes in shape depending on moisture and temperature
- Vulnerable to termites, bacteria, fungi, etc.
What are some things to know about steel when building?
- Strong against tension
- Weak to compression, will tend to buckle
- Relatively expsensive to produce
What are some things to know about brick when building?
- Kind of Strong under compression ( not so much if impacted )
- Lighter then stone to transport
- Weak under tension
- requires special equipment to produce
What are some things you need to know about stone when building?
- Much stronger compared to wood
- Very lasting under compression
- long lasting
- Time and skill to shape
- Not strong under tension
- Heavy to transport
What are some things you need to know about concrete when building?
- Very strong under compression
- Relatively cheap building material
- can be made different for different puposes
- can be shaped easily based on the wood form
- Weak under tension
What are some things you need to know about reinforced concrete when building?
- Strong under tension
- steel rebar can expand under extreme heat, potentially heading to destruction or exploding concrete
Deformation vs Flexibility
Flexibility - When an object moves a little bit but can still go back to the original form.
Deformation - When something breaks, cracks, or bends and cannot go back to the original form.
What is the formula to calculate force?
Force (N) = Mass (kg) x Acceleration (m/s2)
F = ma
What is Mass?
Mass is the quantity of matter within a given object.
What is weight?
Weight is the measure how much gravitational pull on an object.
What is an example of Mass?
The Mass that you have here will be the same Mass anywhere you go.
What is an example of weight?
The weight that you have here will be a third on Mars because of the gravitational pull.
