Common Specialist Technical Principles - term 4 Flashcards
(30 cards)
Types of forces and stresses
Tension, compression, torsion, bending, shear
how tension forces works
it stretch an object, the forces goes opposite ways - pull
how compression forces works
it pushes things together, the forces goes towards others - squash
how shear forces works
happens when two parts of an object want to slide past each other in opposite directions - tearing
how bending force works
it bends materials - bends
how torsion force works
it twist objects - twists, rotate
what does force do?
it can cause object and material to break or change shape
what is stress measured in
stress is the force per unit area, N/m ²
Newton per square metre
does static load move
a static load does not move and will exert far less stress than dynamic load
how to calculate force
force = mass x acceleration
what is acceleration
Acceleration is the rate at which an object’s velocity changes over time
what is velocity
Velocity is the speed of something in a specific direction
techniques that improve functionality
folding, bending, webbing, lamination, fabric interfacing
lamination
process of one or more layers are added to a material to form composite
composites
made from two or more different materials bonded together which often have more useful properties than before - increase strength and rigidity
interfacing
extra layers of fabric stuck or sewn into the inside of product- add strength and rigidity
webbing
fabric tightly woven in a way to give a very high tensile strength (often uses nylon, polyester, Kevlar)
Properties- durable, resistance to abrasion
bending
often used to reinforces and stiffen material - add strength and rigidity
folding
the bending of s flexible material so two sides of the bend are flat against each other and a line called crease that adds flexibility
reinforcing
reinforcing means making a material or structure stronger by adding extra support
Greenhouse effect
Greenhouse effect keeps the heat we get from the sun to warm the planet and then goes back out to the space but there is too much gases like carbon dioxide, methane, water vapor it forms a barrier that keeps the heat in, which cause global warming because of all the extra heat
How plant affect carbon content in our atmosphere
Through photosynthesis they take in carbon dioxide and breath out oxygen
How does manufacture of everyday products affects carbon emissions
Factories use massive amounts of energy — machines, heat, electricity — and most of it still comes from burning fossil fuels like coal or gas.
More burning = more carbon dioxide (CO₂) pumped into the atmosphere.
How to harvest metal ores and minerals and their cons
Mining, scars the landscape and cause loss of habitats
