with a meter stick 3 Thus, the uncertainty is Δx = (1/2)0 002 cm = 0 001 cm The vernier scale consists of a fixed metric scale and a sliding vernier scale
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with a meter stick 3 Thus, the uncertainty is Δx = (1/2)0 002 cm = 0 001 cm The vernier scale consists of a fixed metric scale and a sliding vernier scale
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1
Objective
1. To learn how to use the following measuring devices and understand the
uncertainties associated with them. a) meter stick b) metric ruler c) triple-beam balance d) digital balance e) vernier calipers2. Calculate the area and uncertainty of the table-top by measuring the dimensions
with a meter stick3. Calculate the density and its uncertainty of an aluminum metal block by measuring
its dimensions with the metric ruler and the mass with the triple-beam balance.4. Calculate the density and its uncertainty of an aluminum block by measuring its
dimensions with the vernier calipers and digital balance.Theory
Refer to lab handout on Error Propagation.
Using the Metric Ruler
Consider the following standard metric ruler.
The ruler is incremented in units of centimeter
s (cm). The smallest scale division is a tenth of a centimeter or 1 mm. Therefore, the uncertainty ǻx = smallest increment/2 = 1mm/2 =0.5mm = 0.05cm. Note that a measurement made with this ruler must be stated to a tenth
of a centimeter since the uncertainty is stated to a tenth of a centimeter. In the exampleabove, the length of the object would be stated as x = 2.77 cm ± 0.05 cm. MEASUREMENTS AND ERROR ANALYSIS