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6.1 How does technology enhance &/or limit scientific investigation? -…
6.1 How does technology enhance &/or limit scientific investigation?
6.1.1 Practical Investigations
temperature on reaction rate
technology
IV
temperature probe
digital
DV
stopwatch
digital
relationship
as temp. increased r.r increased
time decreasing
temperature on volume of gas
charles' law
technology for IV & DV
computer simulation
digital
relationship
linear
directly proportional
as temp. increases
volume increases
speed on distance travelled
technology
IV & DV
ruler
analogue
IV
stopwatch
digital
relationship
as speed increased
distance travelled increased
speed= distance/time
pressure on volume of gas
technology
computer sim.
based on mathematicl modelling (laws)
Boyle's Law
relationship
inversely proportional
non-linear
6.1.3 accuracy & error
systematic error
shift measurements from true value
by same amount
each time
eg. calibration error
random error
shift measurement from its true value
by random amount
eg. reaction time
degrees/limitation of accuracy
+/- = 0.5 unit
6.1.4 compare analogue & digital technology
digital technology
higher degree of accuracy (d.p.)
e.g. video recording (high speed camera)
decrease random error
more expensive
e.g. digital scales
possible calibration error
too sensitive
analogue
usually cheaper
lower degree of accuracy
may introduce parallax error
both systematic & random error
thermometer, ruler, measuring cylinder
6.1.5 assessing safety
chemical
MSDS
material safety data sheet
storage
first aid
properties
WHS
faults in technology