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22721524
measurements
Description
- physics - chapter 1 - gce o level syllabus ! - the more important points (those in red) could use more visual diagrams and explaining so u can message me if u want me to add them in, etc ! - all the best studying :)
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physics
physics
gce o-level
Mind Map by
quinelle low
, updated more than 1 year ago
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Created by
quinelle low
about 4 years ago
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Resource summary
measurements
measuring length
metre ruler
precision: 1mm/0.1cm
avoid parallax errors
eye level must be placed directly above the length measured
vernier calipers
accuracy: 0.01cm
check for zero errors
measures short lengths, 1cm - 10cm
micrometer screw gauge
meeasuring lengths up to 1cm
accuracy: 0.1mm
take note of zero error !
basic physical quantities, s.i. units
base quantities
e.g. length, mass, time
derived quantities
e.g. area, volume, speed, density
measurements of time
s.i. units: seconds
regular repeating motions: oscillations
one whole oscillation: period
period of a pendulum depends on length of pendulum
if the length is increased, the period of the pendulum increases
Why take the average of 20 oscillations instead of the timing of 1?
human reaction time is 0.3 - 0.4 sec late
why is the angle of displacement of the swing small?
to keep the oscillation in a single plane
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