WORKSHEET2
UNIT 2
MATERIALS TECHNOLOGY
•Which
materials are widely used in engineering?
•What is meant by recycling?
•How does recycling affect engineering design?
Look at page 14
 Do 1.1.
 Complete 2.a









Look at the meaning of the following words:
magnetism = force of attraction
galvanized = coated with zinc (Zn) to prevent rusting
recyclable = can be recycled
chromium = (Cr) and nickel (Ni) = metals added to steel
to make stainless steel
traces = small quantities
scarcity = limited availability /rarity
insulation = both electrical insulation and thermal
insulation
wire = single strand of metal
 scrap = waste material intended for recycling
 alloy = a mixture of metals sometimes
containing a non-metal, for example carbon (C)
in steel
 brass = an alloy of copper (Cu), zinc and, often
lead (Pb) /led/
 bronze = an alloy of copper and tin (Sn)

melting down = using heat to change the state
of a substance from solid to liquid
 energy-intensive = using a lot of energy
 electrolysis = passing an electrical current
through a liquid or solid in order to separate
chemical compounds
 ore = mineral from which metal is extracted
 hardwood = timber from pine trees

softwood = timber from pine trees
 ironmongery = collective term for small metal
items commonly used in buildings, for example
door handles, hingers, screws, nails.
 Do exercise 2a
 Do exercise 2c
 Homework 3a, 3b, 3c, 3d

WHAT IS MEANT BY CATEGORIZING MATERIALS?

Putting materials into different categories/
types.
Example:
Metals - steal + copper
Do 4
NOTE
brakes are designed to slow down vehicles
or moving parts. often they work through
friction, by applying pressure to pads which are
pressed against the sides of the disc, the
inside of the drum, or directly against a wheel
rim.

Alternatives use systems that use electro
magnetic force, systems that exploit the
braking effects of engines or flywheels (via
clutches and gearboxes), aerodynamic braking
systems ( for example spoilers on aircraft,
parachutes on dragsters), and reverse thrusters
on jet engines. Brake discs are often made of
ferrous metals (iron-base_ for example steel),
or sometimes ceramic materials.
Examples of materials used to make pads
include: compounds of advanced materials
(cars), ferrous metals (trains), rubber (bicycles),
ceramics (performance cars)

Do task 5a.
Note:
 Green refers to ecological issues
 Red refers to heat (red hot means very hot)
 A hot topic is a current important topic
Read the text and answer the questions in 5b
Answers:
1. Because they use friction, which wastes energy as heat
2. They recover heat and use it to power the car
3. The ability to generate high levels of friction, and to
resist the effects of friction and consequent heat
4. 4. Heat from the engine being absorbed by the chassis,
which can damage sensitive parts such as electronic
components and plastic parts