Core Content 3 Flashcards
Describe rotary motion an example and how it’s measured
Follows the path of a circle
Bike wheel
Measured in revolutions per minute
Describe linear motion an example and how it’s measured
Straight line
Supermarket conveyor belt
Measured in speed = distance/time
Describe oscillating motion an example and how it’s measured
Moves back and forth in a circular motion
Electric toothbrush
Measured in oscillations per second or minute
Describe reciprocating motion an example and how it’s measured
Back and forth
Jigsaw blade
Measured in oscillations per minute or second
What is the relationship between force and distance in an input/output mechanism
Increase distance, decrease necessary force
Decrease distance, increase necessary force
Describe a lever including an example
Simplest example of a mechanism that controls and changes motion
Rigid bar that pivots a fulcrum
Car break pedal
Describe cams
Pairs with a follower
Converts rotary motion into reciprocating motion
Snail, pear or eccentric
What is a spur gear
Wheel with teeth around the edge, designed to link with teeth of other gears to make a gear train
What is the name of the input gear
Driver gear
What is the name of the output gear
Driven gear
Describe some characteristics of gears
Usually mounted on shafts
Different sizes, different speeds
State the key relationship with gears
Smaller gears rotate more quickly
Larger gear rotates slowly
What do pulleys and belts do
Transfer rotary motion
Can be separated more than spur gears
Can increase or decrease speed
Diameter inversely proportional to speed
What do linkages do
Direct forces and motion
Change direction
convert type of motion
Describe a basic system
Input —> process —> output
Describe how you can embed components into products
Programmable microcontrollers, blank, download program, small size, versatile
Information from sensors, light/sound/motion displays
Wearable technology
Intelligent watches- steps, heart rate, calories, texts, calls, time, diary
Smart glasses
LDR
Light dependent resistor
Produces signal when light increases
Infrared sensor
Warmth
IR - sensor, warm object in range, signal, hand dryer
PIR - moving warm objects, lights
IR+ - receiver, IR beam, distance
Switch sensors
Off/on
Tilt- signal when upright, heaters
Time delay- stays on for a while after releasing
Push- when button is pressed, momentary
Speakers and buzzers
Speakers, Musical note programming, alarms, satnav
Buzzers- tone when power, constant
Motors
Power, rotary motion, high speed, gearbox converts to controllable speed
Economies of scale
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
Disruptive technologies
Smaller companies take on large companies
Modern demand/thinking
