Flashcards
Measurements
Cards in this deck (23)
- 1In short, how do you use a Vernier Calliper?The 0 will create a rough value for the integer and then look at which other number (on the sliding scale) lines up best.
- 2In short, how do you use a MicrometerTwist end until it clicks, read horizontal scale (top=1mm, bottom=0.5mm) and then read the vertical scale which is a decimal and add it onto the original value
- 3What is the resolution of a Micrometer?0.01mm
- 4What is a 0 error?A systematic error that gives a reading when the value should be 0
- 5How do we fix a zero errorAdd or subtract the zero error
Reading-(zero error) = correct reading
(also if the error is a negative then for example x- (-y) = x+y) - 6Define an instrumenta measuring device used to measure a quantity
- 7Define resolutionthe smallest perceivable change in a measurement on an instrument
OR
the smallest scale division of a measuring instrument - 8How could we make it easier to measure a very thin object?Stack them and divide by how many there are
- 9How could we get more accurate measurements on more difficult objects (e.g spheres)Take multiple measurements at different points
- 10What is absolute uncertainty?The amount either side of a judgement you are absolutely sure that your reading is correct to
- 11What is a reading?When only a single judgement is taken
(examples include on: top pan balance, digital meters, geiger counters, thermometers, pressure gauges, measuring cylinders) - 12What is a measurement?Value of the difference between 2 judgments
(examples include: rulers, vernier callipers, micrometers,travelling microscopes) - 13How do we calculate absolute uncertainty in readings?1/2 incriment
(e.g resolution=0.01mm so uncertainty =+/- 0.005mm) - 14How do we calculate absolute uncertainty in measurments?(1/2 incriment) x2
Essentially resolution
(e.g resolution=0.02, so 0.01=each reading and x2 = +/- 0.02) - 15What do we assume the absolute uncertainty is if we are given a reading in an exam?The finest division
(e.g. reading=56.7mm, then 0.1mm is absolute uncertainty , as we don't know the instrument) - 16State the absolute uncertainty in both the reading and measurement of: a micrometerreading= +/-0.005mm
measurement= +/-0.01mm - 17State the absolute uncertainty in both the reading and measurement of: a rulerreading= +/-0.5mm
measurement= +/-1mm - 18State the absolute uncertainty in both the reading and measurement of: a protractorreading= =/- 0.5 degrees
measurement= +/- 1 degree - 19State the absolute uncertainty in both the reading and measurement of: a stopwatchreading= +/- reaction time
measurement= +/- 2x reaction time - 20State the absolute uncertainty in both the reading and measurement of: an analogue meterreading = +/- 1/2 the finest incriment
measurement = +/- the finest incriment - 21What is the average reaction time of a human we need to learn?+/- 0.2 seconds
(note the resolution of a stopwatch is 0.01s but we aren't that fast) - 22How do we calculate percentage difference?((Actual Value - Calculated Value) / Actual Value) x100
- 23How do we calculate percentage uncertainty?(Absolute Uncertainty) / (Reading or Measurement) x 100
Information
- Description
- Includes Micrometers and Vernier Callipers
- Created by
- Doc Boff · Sep 2018
- Updated
- Apr 8, 2019
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