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Design And Technology > Chapter 2 - part 2 > Flashcards

Chapter 2 - part 2 Flashcards

1
Q

What is a composite material?

A

2 or more materials combined together to create a new material with improved functionality and properties ( enhanced material)

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2
Q

Glass reinforced plastic

GRP

A

Appearance- Covered with a smooth plastic resin, Easily coloured and moulded
Characteristics- Lightweight, good strength to weight ratio, heat+ chemical resistance
Uses- Helmets, Pipes, Liquid storage tanks

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3
Q

Carbon- fibre reinforced plastic

CRP

A

Appearance- a cloth woven from individual strands
Characteristics- very expensive, stiff rigid
Uses- Musical instruments, Sports equipment, Musical instruments

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4
Q

What is a technical textile?

A

Textile that has been developed with enhanced properties to withstand specific uses

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5
Q

Gore tex

A
  • A waterproof and breathable material
  • Material helps reduce build up of condensation inside jackets or boots
  • It’s a very thin membrane sandwiched between a liner and outer material
    Uses- Outdoor clothing
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6
Q

Kevlar

Poly-paraphenyoene terephthalamide

A
  • Non flammable
  • Extremely strong+tear resistance
    Uses- bullet proof vests, personal armour
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7
Q

What are conductive fabrics?

A
  • aka e-textiles
  • allow an electrical impulse to pass through them
  • A silvery fabric or thread, can be sewn
  • Helps link electrical components together
    Uses- Bluetooth connectivity, electronic sports equipment, anti-static clothing
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8
Q

Fire resistant fabric

A
  • E.g Kevlar and Normex
  • Made from armed fibres
  • Can be dyed a range of colours
  • Heat resistance + naked flame(protects wearer)
    Uses- Aprons, Fire blankets
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9
Q

What are Microfibres?

A

They are group of synthetic fibres that are less than one dernier thick

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10
Q

What is Microencapsulation?

A
  • Thin fibres that are used to hold chemicals in tiny capsules
  • Break open releasing chemicals
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11
Q

Microfibres+ Microencapuslation

A
  • Fine synthetic fibre woven into different products
  • Can be absorbent but fast drying
    Uses- Medical textiles, Clothing that is anti bacterial, towels
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12
Q

What does a system consist of?

A

Inputs, processes and outputs

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13
Q

What is a system diagram?

A

A diagram that breaks down the operation into 3 main components: Inputs, process and outputs

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14
Q

What is an open loop system?

A
  • A system that has no feedback
  • It’s unable to make a decision
  • Input directly controls the output
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15
Q

What is a closed loop system?

A

It’s able to make decisions using feedback, usually from a sensor

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16
Q

Some electronic products have a polarity. What does that mean?

A

They have a positive and negative side to them, therefore it matters which way around they go in a circuit

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17
Q

Toggle switch

A

Input component

Uses- Lighting

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18
Q

Push to make switch (PTM)

Normally open

A

Input process

Uses-door bells, keyboard

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19
Q

Push to break switch

Normally closed

A

Input component

Uses- Alarm systems

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20
Q

Light dependant resistor

LDR

A

Input component

Uses- Street light

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21
Q

Thermistor

A

Input component

Uses- Thermostats

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22
Q

Pressure switch

A

Input component

Uses- Burglar alarms

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23
Q

Light emitting diode

LED

A

Output component

Uses- Torches, Tv screens

24
Q

Lamp

A

Output component

Uses- Car headlamps, floodlights

25
Q

Buzzer

A

Output component

Uses- Alarm system, electronic games

26
Q

Speaker

A

Output component

Uses- Headphones, radios

27
Q

What are integrated circuits?

A

They are used to form multiple tasks. Most common one is a microcontroller

28
Q

What is an analogue signal?

A

It’s a continuous signal with an infinite range of values

29
Q

What is a digital signal?

A

It’s either on or off

30
Q

What is a monostable device?

A
  • Aka a single shot timer

- it’s only stable in the off position

31
Q

What is an astable device?

A
  • Gives an oscillating output
32
Q

What are counting devices?

A

They are used to keep a tally of how many times and event occurs

33
Q

Linear movement

A

Movement in one direction along a straight line

34
Q

Reciprocating motion

A

Repetitive up and down motion

35
Q

Oscillating material

A

Similar to reciprocating but it’s in a curved motion

36
Q

Rotary motion

A

A circular motion

37
Q

What is a lever?

A

A simple way to gain mechanical advantage

38
Q

What is equilibrium?

A

When the effort and load are equal

39
Q

Class 1 lever

A
  • Fulcrum in the middle

- Load and effort on the opposite ends

40
Q

Class 2 lever

A
  • Fulcrum on the side
  • Load next to the fulcrum
  • Effort next to the load
41
Q

Class 3 lever

A
  • Fulcrum is on the side
  • Effort is near the fulcrum
  • Load is next to the effort
42
Q

Reverse motion linkage

A

Changes the direction of input so that the output is in the opposite direction

43
Q

Parallel motion or push/pull linkage

A

Input and output travel in the same direction. Uses 3 linking bars

44
Q

Bell crank linkage

A

Changes the direction of Input through a 90 angle

45
Q

Crank and slider

A

Changes rotary motion into reciprocating motion and vice versa

46
Q

Treadle linkage

A

Changes rotary motion into oscillating motion or vice versa

47
Q

What is a cam used for?

A

To change rotary motion into reciprocating motion using a follower

48
Q

Eccentric or circular cam

A

Steady rise and fall

49
Q

Pear cam

A

Rapid rise and fall

50
Q

Snail cam

A

Steady rise and sudden drop

51
Q

Heart shaped cam

A

Slight rise and fall

52
Q

Flat follower

A

Not very accurate, lots of friction, can cope well under load

53
Q

Knife edged follower

A

Tracks movement of cam accurately, low friction

54
Q

Roller follower

A

Some accuracy, Efficient under load

55
Q

Block and tackle

A

2 or more pulleys used to reduce the effort required to lift or move a heavy load

Design And Technology (9 decks)

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