Comprehensive Study Notes on Engineering Materials, Machinery, and Physical Mechanisms
Engineering Materials, Properties, and Case Studies
Polycarbonate (PC)
Key Properties: Transparent, impact resistant, lightweight
Common Applications: Auto headlights, helmets, bullet-proof glass
Famous Example / Case Study: Riot shields, BMW headlamps
Wikipedia Reference: Polycarbonate
Acrylic (PMMA)
Key Properties: Transparent, glossy, weather resistant
Common Applications: Signage, aquariums, skylights
Famous Example / Case Study: Retail displays, Plexiglas
Wikipedia Reference: Acrylic glass
ABS Plastic
Key Properties: Tough, lightweight, good machinability
Common Applications: LEGO bricks, appliances, helmets
Famous Example / Case Study: LEGO toy bricks
Wikipedia Reference: Acrylonitrile butadiene styrene
Nylon
Key Properties: Strong, elastic, abrasion resistant
Common Applications: Textiles, ropes, parachutes
Famous Example / Case Study: Nylon stockings, climbing ropes
Wikipedia Reference: Nylon
Polyester
Key Properties: Durable, wrinkle resistant
Common Applications: Clothing, PET bottles, textiles
Famous Example / Case Study: PET water bottles
Wikipedia Reference: Polyester
Kevlar
Key Properties: High tensile strength, heat resistant
Common Applications: Bulletproof vests, helmets, sports gear
Famous Example / Case Study: NIJ body armor
Wikipedia Reference: Kevlar
Carbon Fiber
Key Properties: Lightweight, high stiffness, strong
Common Applications: Bicycles, aircraft, racing cars
Famous Example / Case Study: Formula 1 monocoques
Wikipedia Reference: Carbon fiber reinforced polymer
Aluminium
Key Properties: Lightweight, corrosion resistant, ductile
Common Applications: Aircrafts, cans, window frames
Famous Example / Case Study: Boeing aircrafts
Wikipedia Reference: Aluminium
Steel (Mild / Carbon)
Key Properties: Strong, ductile, weldable
Common Applications: Construction, automotive, tools
Famous Example / Case Study: Skyscraper frameworks
Wikipedia Reference: Steel
Stainless Steel
Key Properties: Corrosion resistant, hygienic, durable
Common Applications: Cutlery, medical instruments
Famous Example / Case Study: Surgical tools
Wikipedia Reference: Stainless steel
Copper
Key Properties: Excellent conductor, malleable
Common Applications: Electrical wiring, plumbing
Famous Example / Case Study: Electric cables
Wikipedia Reference: Copper
Brass
Key Properties: Acoustic, corrosion resistant, workable
Common Applications: Musical instruments, fittings
Famous Example / Case Study: Trumpets, door handles
Wikipedia Reference: Brass
Bronze
Key Properties: Hard, wear-resistant, aesthetic
Common Applications: Sculptures, medals, ship parts
Famous Example / Case Study: Olympic bronze medal
Wikipedia Reference: Bronze
Glass
Key Properties: Transparent, brittle, recyclable
Common Applications: Windows, bottles, optics
Famous Example / Case Study: Stained glass windows
Wikipedia Reference: Glass
Tempered Glass
Key Properties: Heat treated, strong, shatter safe
Common Applications: Smartphone screens, car windows
Famous Example / Case Study: Gorilla Glass (Corning)
Wikipedia Reference: Toughened glass
Ceramic
Key Properties: Hard, brittle, heat resistant
Common Applications: Tiles, pottery, electronics
Famous Example / Case Study: Ceramic capacitors
Wikipedia Reference: Ceramic
Porcelain
Key Properties: White, smooth, strong
Common Applications: Crockery, bathroom fittings
Famous Example / Case Study: Fine china pottery
Wikipedia Reference: Porcelain
Wood (Teak)
Key Properties: Durable, termite resistant
Common Applications: Furniture, boats
Famous Example / Case Study: Classic Indian furniture
Wikipedia Reference: Teak
Plywood
Key Properties: Strong, layered composite wood
Common Applications: Furniture, construction
Famous Example / Case Study: IKEA furniture
Wikipedia Reference: Plywood
Bamboo
Key Properties: Renewable, strong, flexible
Common Applications: Furniture, scaffolding, flooring
Famous Example / Case Study: Bamboo bicycles
Wikipedia Reference: Bamboo
Concrete
Key Properties: High compressive strength
Common Applications: Buildings, bridges
Famous Example / Case Study: Hoover Dam
Wikipedia Reference: Concrete
Reinforced Concrete (RCC)
Key Properties: Concrete + steel rods, tensile & compressive strength
Common Applications: Skyscrapers, highways
Famous Example / Case Study: Burj Khalifa structure
Wikipedia Reference: Reinforced concrete
Titanium
Key Properties: Lightweight, corrosion resistant, biocompatible
Common Applications: Aircraft, implants, watches
Famous Example / Case Study: Titanium prosthetics
Wikipedia Reference: Titanium
Rubber (Natural)
Key Properties: Elastic, water resistant
Common Applications: Tires, hoses, footwear
Famous Example / Case Study: Michelin tires
Wikipedia Reference: Natural rubber
Silicone
Key Properties: Heat resistant, flexible, non-reactive
Common Applications: Bakeware, medical implants, sealants
Famous Example / Case Study: Silicone spatulas
Wikipedia Reference: Silicone
Foam (PU/EPS)
Key Properties: Lightweight, cushioning
Common Applications: Packaging, furniture, insulation
Famous Example / Case Study: Thermocol, foam mattresses
Wikipedia Reference: Foam
Leather
Key Properties: Durable, aesthetic, flexible
Common Applications: Shoes, bags, upholstery
Famous Example / Case Study: Louis Vuitton bags
Wikipedia Reference: Leather
Paper
Key Properties: Lightweight, recyclable, versatile
Common Applications: Books, packaging
Famous Example / Case Study: Origami art
Wikipedia Reference: Paper
Cardboard
Key Properties: Strong, foldable
Common Applications: Packaging, furniture prototypes
Famous Example / Case Study: Amazon boxes
Wikipedia Reference: Cardboard
Biodegradable Plastics (PLA)
Key Properties: Compostable, plant-based
Common Applications: Food packaging, cutlery
Famous Example / Case Study: Eco-friendly straws
Wikipedia Reference: Polylactic acid
Teflon (PTFE)
Key Properties: Non-stick, low friction, chemically inert, heat resistant
Common Applications: Cookware coatings, gaskets, bearings, insulation
Famous Example / Case Study: Teflon-coated frying pans
Wikipedia Reference: PTFE
Polypropylene (PP)
Key Properties: Lightweight, fatigue resistant, chemical resistant, cheap
Common Applications: Packaging, ropes, furniture, automotive parts
Famous Example / Case Study: IKEA plastic chairs, reusable crates
Wikipedia Reference: Polypropylene
Polyethylene (PE – HDPE / LDPE)
Key Properties: Flexible, waterproof, impact resistant
Common Applications: Bottles, pipes, bags, water tanks
Famous Example / Case Study: Milk jugs, HDPE pipes
Wikipedia Reference: Polyethylene
Polyurethane (PU)
Key Properties: Flexible, cushioning, versatile
Common Applications: Foam cushions, insulation, footwear
Famous Example / Case Study: Memory foam mattresses
Wikipedia Reference: Polyurethane
Gore-Tex (Expanded PTFE)
Key Properties: Waterproof yet breathable
Common Applications: Outdoor wear, shoes, medical implants
Famous Example / Case Study: Gore-Tex jackets
Wikipedia Reference: Gore-Tex
Silica Gel
Key Properties: Absorbs moisture, porous
Common Applications: Packaging, electronics storage
Famous Example / Case Study: Desiccant packets
Wikipedia Reference: Silica gel
Graphene
Key Properties: Super-strong, lightweight, highly conductive
Common Applications: Electronics, composites, sensors
Famous Example / Case Study: Graphene-coated tennis rackets
Wikipedia Reference: Graphene
Fiberglass
Key Properties: Lightweight, durable, insulating
Common Applications: Boats, insulation, roofing sheets
Famous Example / Case Study: Fiberglass surfboards
Wikipedia Reference: Fiberglass
Cork
Key Properties: Lightweight, compressible, insulating
Common Applications: Bottle stoppers, flooring, soundproofing
Famous Example / Case Study: Wine bottle stoppers
Wikipedia Reference: Cork (material)
Jute
Key Properties: Natural, biodegradable, strong fibers
Common Applications: Bags, ropes, mats
Famous Example / Case Study: Jute shopping bags
Wikipedia Reference: Jute
Machine and Equipment Working Principles
Punching Machine
Principle / Mechanism: Lever & pressure multiplication
Type of Machine: Mechanical
Stapler
Principle / Mechanism: Lever principle
Type of Machine: Mechanical
Scissors
Principle / Mechanism: Double lever (Class I levers combined)
Type of Machine: Mechanical
Nutcracker
Principle / Mechanism: Class II lever
Type of Machine: Mechanical
Bottle Opener
Principle / Mechanism: Class II lever
Type of Machine: Mechanical
Bicycle
Principle / Mechanism: Chain drive, gear ratio
Type of Machine: Mechanical
Washing Machine (Spin)
Principle / Mechanism: Centrifugal force
Type of Machine: Household
Vacuum Cleaner
Principle / Mechanism: Air pressure difference (suction)
Type of Machine: Household
Elevator (Lift)
Principle / Mechanism: Pulley & counterweight system
Type of Machine: Mechanical
Escalator
Principle / Mechanism: Conveyor belt mechanism
Type of Machine: Mechanical
Pressure Cooker
Principle / Mechanism: High pressure raises boiling point
Type of Machine: Household
Ballpoint Pen
Principle / Mechanism: Capillary action for ink flow + surface tension to avoid leaking
Type of Machine: Household
Sewing Machine
Principle / Mechanism: Needle + shuttle loop (thread interlocking): rotational, oscillatory and frictional motion
Type of Machine: Household
Camera
Principle / Mechanism: Refraction through lens forming image
Type of Machine: Optical
Microscope
Principle / Mechanism: Refraction of light through convex lenses
Type of Machine: Optical
Telescope
Principle / Mechanism: Refraction (lenses) or reflection (mirrors)
Type of Machine: Optical
Magnifying Glass
Principle / Mechanism: Convex lens refraction
Type of Machine: Optical
Periscope
Principle / Mechanism: Reflection of light using plane mirrors
Type of Machine: Optical
Thermometer
Principle / Mechanism: Expansion of liquid with temperature
Type of Machine: Measuring
Barometer
Principle / Mechanism: Air pressure on mercury column
Type of Machine: Measuring
Spring Balance
Principle / Mechanism: Hooke’s Law (elasticity of spring)
Type of Machine: Measuring
Weighing Balance
Principle / Mechanism: Principle of moments (torque balance)
Type of Machine: Measuring
Seismograph
Principle / Mechanism: Inertia of rest
Type of Machine: Measuring
ATM Card Reader
Principle / Mechanism: Electromagnetic induction (magnetic strip)
Type of Machine: Electronic
Induction Cooker
Principle / Mechanism: Electromagnetic induction heating
Type of Machine: Household / Electrical
Transformer
Principle / Mechanism: Mutual induction (Faraday’s Law)
Type of Machine: Electrical
Electric Motor
Principle / Mechanism: Electromagnetic force (Fleming’s Left-hand Rule)
Type of Machine: Electrical
Electric Generator
Principle / Mechanism: Electromagnetic induction (Fleming’s Right-hand Rule)
Type of Machine: Electrical
Refrigerator
Principle / Mechanism: Compression & expansion of gas (refrigeration cycle)
Type of Machine: Household
Fundamental Mechanical Principles and Physical Phenomena
Hook & Loop Fastening
Description: Interlocking hooks & loops create a temporary bond.
Examples of Products: Velcro straps, shoes, BP cuffs
Inventor / Origin: George de Mestral (1941)
Wikipedia Reference: Velcro
Capillary Action
Description: Liquid rises in narrow tubes due to adhesion & cohesion.
Examples of Products: Fountain pens, wicks, markers
Inventor / Origin: Ancient China
Wikipedia Reference: Capillary action
Interlocking Teeth
Description: Teeth guided by slider to lock/unlock.
Examples of Products: Zippers, gear systems
Inventor / Origin: Whitcomb L. Judson
Wikipedia Reference: Zipper
Rolling Ball
Description: Rotating ball distributes ink/liquid.
Examples of Products: Ballpoint pens, deodorant rollers
Inventor / Origin: László Bíró
Wikipedia Reference: Ballpoint pen
Vacuum / Negative Pressure
Description: Removing air creates a suction seal.
Examples of Products: Vacuum cleaners, suction cups
Inventor / Origin: Hoover Co.
Wikipedia Reference: Vacuum cleaner
Lever & Fulcrum
Description: Pivot multiplies applied force.
Examples of Products: Scissors, pliers, staplers
Inventor / Origin: Archimedes
Wikipedia Reference: Lever
Wheel & Axle
Description: Circular motion reduces friction.
Examples of Products: Cars, carts, door knobs
Inventor / Origin: Mesopotamia (3500 BC)
Wikipedia Reference: Wheel
Pulley Mechanism
Description: Rope over wheel changes direction of force.
Examples of Products: Elevators, cranes
Inventor / Origin: Ancient Greece
Wikipedia Reference: Pulley
Gear Train
Description: Toothed wheels transmit torque.
Examples of Products: Clocks, bicycles
Inventor / Origin: Early mechanics
Wikipedia Reference: Gear train
Spring Tension
Description: Elastic material stores & releases energy.
Examples of Products: Watches, pens, mattresses
Inventor / Origin: Robert Hooke
Wikipedia Reference: Spring
Hydraulic Pressure (Pascal’s Law)
Description: Force transmitted via incompressible fluid.
Examples of Products: Car brakes, hydraulic lifts
Inventor / Origin: Blaise Pascal
Wikipedia Reference: Hydraulics
Pneumatic Pressure
Description: Compressed air powers motion.
Examples of Products: Air brakes, paint sprayers
Inventor / Origin: 19th century industry
Wikipedia Reference: Pneumatics
Arch Support
Description: Curved structures transfer load to sides.
Examples of Products: Bridges, aqueducts
Inventor / Origin: Romans
Wikipedia Reference: Arch
Cantilever
Description: Beam fixed at one end projects freely.
Examples of Products: Diving boards, cantilever bridges
Inventor / Origin: Modern structural eng.
Wikipedia Reference: Cantilever
Suspension
Description: Load hung via cables/chains.
Examples of Products: Suspension bridges, swings
Inventor / Origin: 19th century bridges
Wikipedia Reference: Suspension bridge
Airfoil / Bernoulli’s Principle
Description: Pressure difference generates lift.
Examples of Products: Airplanes, fans, drones
Inventor / Origin: Wright brothers (1903)
Wikipedia Reference: Airfoil
Archimedes’ Screw
Description: Inclined spiral lifts water upwards.
Examples of Products: Irrigation, pumps
Inventor / Origin: Archimedes
Wikipedia Reference: Archimedes' screw
Siphon Effect
Description: Fluid moves over elevation using gravity.
Examples of Products: Toilets, fountains
Inventor / Origin: Ancient engineers
Wikipedia Reference: Siphon
Magnetic Attraction
Description: Opposite poles attract, used for closure.
Examples of Products: Fridge doors, magnetic locks
Inventor / Origin: William Gilbert (1600s)
Wikipedia Reference: Magnetism
Electromagnetism
Description: Current-carrying coil generates magnetism.
Examples of Products: Electric bells, speakers, relays
Inventor / Origin: Hans Oersted
Wikipedia Reference: Electromagnetism
Piezoelectric Effect
Description: Pressure generates electric charge.
Examples of Products: Lighters, microphones
Inventor / Origin: Pierre & Jacques Curie
Wikipedia Reference: Piezoelectricity
Photoelectric Effect
Description: Light knocks out electrons -> electricity.
Examples of Products: Solar panels, sensors
Inventor / Origin: Albert Einstein
Wikipedia Reference: Photoelectric effect
Induction (Faraday’s Law)
Description: Moving magnetic field induces current.
Examples of Products: Transformers, induction cooktops
Inventor / Origin: Michael Faraday
Wikipedia Reference: Electromagnetic induction
Gyroscopic Stability
Description: Spinning mass resists tilt.
Examples of Products: Bicycles, drones, gyroscopes
Inventor / Origin: Jean-Bernard Léon Foucault
Wikipedia Reference: Gyroscope
Buoyancy
Description: Upthrust equals displaced fluid weight.
Examples of Products: Ships, submarines
Inventor / Origin: Archimedes
Wikipedia Reference: Buoyancy
Surface Tension
Description: Liquid surface behaves like stretched film.
Examples of Products: Soap bubbles, droplet shapes
Inventor / Origin: Plateau, Laplace
Wikipedia Reference: Surface tension
Capstan / Friction Lock
Description: Rope tension amplified by friction wraps.
Examples of Products: Ship anchors, winches
Inventor / Origin: Ancient sailors
Wikipedia Reference: Capstan
Clutch Mechanism
Description: Engages/disengages rotating shafts.
Examples of Products: Automobiles, machines
Inventor / Origin: Industrial revolution
Wikipedia Reference: Clutch
Cam & Follower
Description: Converts rotary to reciprocating motion.
Examples of Products: Sewing machines, engines
Inventor / Origin: 14th century Europe
Wikipedia Reference: Cam
Ratchet & Pawl
Description: Allows rotation in one direction only.
Examples of Products: Wrenches, clocks
Inventor / Origin: Clockmakers
Wikipedia Reference: Ratchet
Escapement
Description: Releases gear at intervals for precision.
Examples of Products: Mechanical clocks
Inventor / Origin: Medieval horology
Wikipedia Reference: Escapement
Helical Coil / Spiral Spring
Description: Stores energy compactly.
Examples of Products: Mattresses, pens
Inventor / Origin: 18th century
Wikipedia Reference: Coil spring
Biomimicry Adhesion
Description: Mimicking natural adhesion (gecko feet).
Examples of Products: Climbing robots, tapes
Inventor / Origin: 21st century material science
Wikipedia Reference: Biomimetics
Thermochromism
Description: Color changes with temperature.
Examples of Products: Mood rings, thermometers
Inventor / Origin: 20th century
Wikipedia Reference: Thermochromism
Shape Memory Alloy (SMA)
Description: Metal returns to shape when heated.
Examples of Products: Medical stents, glasses frames
Inventor / Origin: 1960s research
Wikipedia Reference: Shape-memory alloy