# Measurements in addition to Uncertainties Uncertainties in addition to Errors Resolution This is the s

## Measurements in addition to Uncertainties Uncertainties in addition to Errors Resolution This is the s

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Precision in addition to Accuracy If repeated measurements always give very similar results, they are precise  they have small r in addition to om error in addition to low uncertainty. However, this does not mean they are accurate. If repeated measurements are fairly near to the true value, they are accurate  the systematic error is small. However, they may not be precise. Accurate but imprecise Precise but inaccurate Ruler scale True value To reduce error: Always repeat readings if possible. Take readings at eye level Use take at least 6 sets of readings Check as long as a zero error be as long as e starting

Determining Errors in addition to Uncertainties On a single reading, the (+ or -) uncertainty could be considered equal to either the instrument resolution or the human error, depending which is largest. Q. Measure the length of your pen using a ruler. What is a) the uncertainty b) the % uncertainty

If an average reading is calculated from a few readings, the uncertainty equals ½ x the range: E.g. In an experiment a toy car was rolled repeatedly down a ramp in these times 8.12s, 8.16s, 8.08s, 8.14s, 8.10s Average time = 8.12s, however we are not certain that this is the true value. Range = 8.16  8.08 = 0.08 so uncertainty = +/-0.04 Time = 8.12 +/- 0.04 s (Note: With multiple oscillations, when dividing to find T you also divide the absolute uncertainty) Subtitle Text Subtitle Text

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## Garofoli, Joe Features Writer

Garofoli, Joe is from United States and they belong to San Francisco Chronicle and they are from  San Francisco, United States got related to this Particular Journal. and Garofoli, Joe deal with the subjects like Features/Lifestyle; Local News

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