measurements

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- 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 :)
quinelle low
Mind Map by quinelle low, updated more than 1 year ago
quinelle low
Created by quinelle low almost 4 years ago
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Resource summary

measurements
  1. measuring length
    1. metre ruler
      1. precision: 1mm/0.1cm
        1. avoid parallax errors
          1. eye level must be placed directly above the length measured
        2. vernier calipers
          1. accuracy: 0.01cm
            1. check for zero errors
              1. measures short lengths, 1cm - 10cm
              2. micrometer screw gauge
                1. meeasuring lengths up to 1cm
                  1. accuracy: 0.1mm
                    1. take note of zero error !
                  2. basic physical quantities, s.i. units
                    1. base quantities
                      1. e.g. length, mass, time
                      2. derived quantities
                        1. e.g. area, volume, speed, density
                      3. measurements of time
                        1. s.i. units: seconds
                          1. regular repeating motions: oscillations
                            1. one whole oscillation: period
                              1. period of a pendulum depends on length of pendulum
                                1. if the length is increased, the period of the pendulum increases
                              2. Why take the average of 20 oscillations instead of the timing of 1?
                                1. human reaction time is 0.3 - 0.4 sec late
                                2. why is the angle of displacement of the swing small?
                                  1. to keep the oscillation in a single plane
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