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Module 6: Technologies Scientific Investigation and Technology, based on…
Module 6: Technologies
Scientific Investigation and Technology
How does the technology enhance and/or limit scienific investigation?
Practical Investigation
temperature of rate reaction
technology
IV
temperature probe
DV
stopwatch
relationship
as temperature increases the reaction rate increases
temperature on volume of gas
technology
IV: Computer simulation
DV: Computer simulatino
Charle's Law
relationship
linear
directly proportional
speed on distance travelled
technology
IV: Ruler, Stopwatch
DV: Ruler
Analogue
relationship
as speed increased the distance also increased
Speed = distance / time
directly proportinal
pressure on volume of gas
Boyle's Law
technology
IV: Computer simulation
DV: Computer simulation
relationship
as pressure increased a pressure decreased
exponential
Technologies
digital
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e.g. video recording, digital scales
analogue
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e.g. ruler
Accuracy and Error
Random Error
shift measure by a random amount each time
affects reliability
Systematic Error
shift measurements from their true value by the same amount each time
e.g. poor calibration
Degree of accuracy
plus or minus 0.5 of that unit
also called limitation of accuracy
Benefits Limitations Technologies
Digital
benefits
Higher degrees of accuracy
reduce random error in computer simulations
limitations
introduces possible calibration error
too sensitive
expensive
Analogue
benefits
cheap
limitations
parrallax error
e.g. thermometer, ruler and measuring cylinder
Safety of Technologies
chemicals
MSDS (material safety data sheet)
propertiesw
first aid
storage
equipment
WHS
faults in technology
based on mathematical modelling laws
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