How to Read and Record Measurements Taking Measurements How do we know if a measurement is accurate (correct)? Accuracy depends on: Skill of person taking measurement Capacity of the measuring instrument Read measurements to the full capacity of the instrument A__ __ 1 __ __ __ ___ __ __ __ __ __ __
__ __ __ B 1 Always read to the smallest mark, and then estimate another digit beyond the smallest mark On ruler A, the smallest increment is 0.1cm, so the estimated digit should be the nearest 0.01cm On ruler B, the smallest increment is 1 cm, so the estimated digit should be the nearest 0.1cm On ruler B, what should be recorded as the length of the blue block? Around 0.5cm __
__ __ ___ __ __ __ __ __ __ __ __ __ B __ 1 Around 0.52cm A__ 1 On ruler A, what should be recorded as the length of the blue
block? What if the measured value falls on a scale marking? If the measured value falls on a scale marking, the estimated digit should be a zero. The zero is important! Even though it doesnt change the value of the measurement, it reflects the precision of the instrument. __ __ __ ___ __ __ __ __ __ __ __ __ __
B __ 1 Around 0.90cm A__ 1 On ruler A, what should be recorded as the length of the blue block? What if the measured value falls on a scale marking? On ruler B, what should be recorded as the length of the blue block? Around 1.0cm __ __
__ ___ __ __ __ __ __ __ __ __ __ B __ 1 Around 1.00cm A__ 1 On ruler A, what should be recorded as the length of the blue block?
How do I figure out the smallest increments on the scale? 0 and 1 (1 whole unit) or 2 and 4 (2 whole units) or 9 and 10 etc __ __ __ ___ __ __ __ __ __ __ __ __ __ B __ 1
For example,the number of marks between A__ 1 Divide the number of whole units by the number of marks between the two units on the scale How do I figure out the smallest increments on the scale? Count the marks from 4 to 5 (1 whole unit)on the ruler to the right There are 10 marks Now divide 1unit/10marks= 0.1 So, the smallest increments on the scale are 0.1cm That means to estimate to the 0.01cm place
____ 4 __ __ __ __ ___ __ __ __ __ ____5 __ __ __ __ __ __ __ __ How do I figure out the smallest increments on the scale? Count the marks from 4 to 5 on the ruler to the right There are 5 marks Now divide
1unit/5marks= 0.2 So, the smallest increments on the scale are 0.2cm We could reasonably only estimate to the 0.1cm, since there isnt a mark for every 0.1cm. ____ 4 __ __ __ __ ____5 __ __ __ __ How do I figure out the smallest increments on the scale? Count the marks from 5 to 10 (5 whole units) on the ruler to the right There are 5 marks Now divide
5units/5marks= 1 So, the smallest increments on the scale are 1 cm So we would estimate to the 0.1cm ____ 5 __ __ __ __ ____10 __ __ __ __ Now lets practice!
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