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DT > Core Content 3 > Flashcards

Core Content 3 Flashcards

1
Q

Describe rotary motion an example and how it’s measured

A

Follows the path of a circle
Bike wheel
Measured in revolutions per minute

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2
Q

Describe linear motion an example and how it’s measured

A

Straight line
Supermarket conveyor belt
Measured in speed = distance/time

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3
Q

Describe oscillating motion an example and how it’s measured

A

Moves back and forth in a circular motion
Electric toothbrush
Measured in oscillations per second or minute

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4
Q

Describe reciprocating motion an example and how it’s measured

A

Back and forth
Jigsaw blade
Measured in oscillations per minute or second

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5
Q

What is the relationship between force and distance in an input/output mechanism

A

Increase distance, decrease necessary force

Decrease distance, increase necessary force

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6
Q

Describe a lever including an example

A

Simplest example of a mechanism that controls and changes motion
Rigid bar that pivots a fulcrum
Car break pedal

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7
Q

Describe cams

A

Pairs with a follower
Converts rotary motion into reciprocating motion
Snail, pear or eccentric

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8
Q

What is a spur gear

A

Wheel with teeth around the edge, designed to link with teeth of other gears to make a gear train

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9
Q

What is the name of the input gear

A

Driver gear

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10
Q

What is the name of the output gear

A

Driven gear

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11
Q

Describe some characteristics of gears

A

Usually mounted on shafts

Different sizes, different speeds

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12
Q

State the key relationship with gears

A

Smaller gears rotate more quickly

Larger gear rotates slowly

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13
Q

What do pulleys and belts do

A

Transfer rotary motion
Can be separated more than spur gears
Can increase or decrease speed
Diameter inversely proportional to speed

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14
Q

What do linkages do

A

Direct forces and motion
Change direction
convert type of motion

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15
Q

Describe a basic system

A

Input —> process —> output

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16
Q

Describe how you can embed components into products

A

Programmable microcontrollers, blank, download program, small size, versatile
Information from sensors, light/sound/motion displays

17
Q

Wearable technology

A

Intelligent watches- steps, heart rate, calories, texts, calls, time, diary
Smart glasses

18
Q

LDR

A

Light dependent resistor

Produces signal when light increases

19
Q

Infrared sensor

A

Warmth
IR - sensor, warm object in range, signal, hand dryer
PIR - moving warm objects, lights
IR+ - receiver, IR beam, distance

20
Q

Switch sensors

A

Off/on
Tilt- signal when upright, heaters
Time delay- stays on for a while after releasing
Push- when button is pressed, momentary

21
Q

Speakers and buzzers

A

Speakers, Musical note programming, alarms, satnav

Buzzers- tone when power, constant

22
Q

Motors

A

Power, rotary motion, high speed, gearbox converts to controllable speed

23
Q

Economies of scale

A 
Increase scale, decrease cost per unit
Spread out cost of machinery
More efficient, less waste
Bulk buy materials
Specialise workers
Components in LICs
Assembly in HICs
24
Q

Disruptive technologies

A

Smaller companies take on large companies

Modern demand/thinking

25
Q

Additive manufacturing

A

Stero lithography- laser traces shape onto liquid resin, repeated
Laser sintering- laser traces shape onto powder, repeated
3D printing- prints thermoplastics, build up, complex shapes need added support

26
Q

Advanced robotics abilities

A

Automatic manufacturing, welding, handling, painting

27
Q

The internet of things

A

Communication between connected electrical devices

28
Q

Virtual reality

A

Test new concepts
Digital modelling
Increase productivity and quality
Reduce waste and energy use

29
Q

Maker movement

A

Affordable, accessible tech
Customisable
Etsy, Kickstarter

DT (5 decks)

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