Year 10 Assessment Revision Flashcards
define a composite material.
a material made from two or more materials with different properties
how do you calculate RPM if the driver gear is larger?
multiply driver revs by multiplier
How do you calculate RPM if the driver gear is smaller?
divide driver gear revs by multiplier
what does sustainable mean?
not causing permanent damage to the environment and not using up fossil fuels
Name a sustainable textile example
paper
cotton
softwood from ethical sources
name the 4 linkages
reverse motion linkage
parallel motion linkage
crank and slider linkage
bell crank linkage
explain reverse motion linkage
the direction of movement in one rod is reversed in the other
explain parallel motion linkage
rods are parallel to each other. Top rod moves left. bottom rod moves right.
explain crank and slider linkage
the rods move forwards and backwards in slider
explain bell crank linkage
it allows horizontal movement to be converted to vertical movement and vice versa
what is a hardwood?
usually deciduous, tight grain, dense and expensive wood
what is a softwood?
fast growing, evergreen & cheap wood
hardwood examples
oak
beech
balsa
ash
softwood examples
pine
larch
spruce
what is crowd funding?
it involves using websites to promote an idea. Backers choose to invest to help fund the idea. Backers get some advantages like:
free gifts
discounts
percentage share of the company
what is fair trade?
it makes sure producers get a fair price.
fair trade producers have to meet certain standards that benefit:
workers
the environment
producers
Define material toughness
the ability of a material to absorb energy and not rupture/ fracture
define rotary motion
follows a circular path around a fixed point
example = bicycle wheel
define linear motion
in a straight line in one direction
example = train
define oscillating motion
occurs when an object swings from one side to the other from a fixed point
example = pendulum clock
define reciprocating motion
a repetitive motion from one side to the other
example = piston (in an engine)
what is a microcontroller?
an integrated circuit. It can be programmed to perform different processing functions
what are some advantages of a microcontroller?
size of circuit is reduced
can be reprogrammed many times
add to flexibility by having pins for connecting several input and output devices
what are some disadvantages of a microcontroller?
often cost more
programming software and hardware required
language of system must be learned
what is planned obsolescence?
when a product is designed to become useless quickly
example = disposable razor or phones
what do the 6 Rs do?
they reduce the impact of a new product on the environment
Name the 6 Rs
Repair Reuse Recycle Rethink Reduce Refuse
define Reuse
passing on a product e.g. tyre for a swing
define Rethink
thinking about the design from an environmental perspective
what are surface treatments?
they change the properties of materials
name 4 surface treatments
dip coating
powder coating
tanalising
flame retardance
what does dip coating do?
creates a soft, smooth finish
used for wire racks and tool handles
what does powder coating do?
creates an even coat and almost no waste
what does tanalising do?
prevents insect attacks and wood decay
used for outdoor wood like fences
what does flame retardance do?
makes a fabric less likely to catch fire
used for workwear
name three benefits of printing
- can be done in small or large quantities
- can easily repeat designs
- actual printing process is quick
name three benefits of injection moulding
- fast production at a high consistency
- hardly any labour costs
- little post production scrap
name three benefits of die cutting
- manufacturing techniques are the same for all materials
- parts can be removed from material with ease
- fast and continuous production
name three materials and their modifications
wood - seasoned
metals - annealising
polymers - addition of UV stabilisers
what’s the purpose of seasoning wood?
reduces moisture therefore makes it stronger
why are metals annealised?
heating then slowly cooling a metal makes it more malleable
Why are UV stabilisers added to polymers?
to prevent discolouration of polymers left outside
name benefits of templates to do with quality, accuracy and speed
- Identical shapes
- Products are consistent
- accurate components
- can check components against templates
- quicker
- easier
name benefits of jigs to do with quality, accuracy and speed
- guides tools
- components are consistent
- specifically made for a particular job
- minimal measuring
- reduces effort
- saves time
