Measurement Lab Activity Paper

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Significant Figures and Measurement Lab Activity
In this activity you will learn the concept behind significant figures and how to make measurements
and calculations using that concept.
Materials: 1 wooden splint, 1 sheet of lined paper
Any measuring device is limited in its precision. To a large degree, the precision of a
measurement is determined by the nature of measuring instrument itself. Specifically, to what
degree the instrument is subdivided will determine to what decimal place the measurement
will be reported. In science, we typically limit ourselves to measuring scales that have been
divided based on powers of ten. A meter stick, for instance, might be divided into tenths,
hundredths, and thousands of a meter if the smallest scale division marked on the ruler is the
millimeter. Each of the digits you report in your measurement is considered a significant
figure. In general, we report measurements by including all of the digits of which we are
certain plus one estimated digit. In making measurements with a metric scale, it is
conventional to report measurements to the smallest scale division marked on the scale, plus
one estimate beyond the smallest scale division. There are exceptions to these rules that
differ based on what you are measuring or the measurement technique, but these rules are
generally followed.
Procedure: For this activity, you will be measuring the geometric shapes on the back of this
page using the stick that has been provided to you. All Trial 1 measurements are to be made
with the side of the stick which has not been subdivided. This is the “uncalibrated” side of
your stick. Trial 2 measurements will be made with the “calibrated” side of the stick.
1. Measure the following quantities using the unmarked stick.
a. The length and width of the rectangle
b. The base, height, and all three sides of the triangle
c. The radius and diameter of the circle.
2. Record your measurement in the trial 1 section of the data table, to the correct
number of significant figures based on the concepts described above.
3. Make the following calculations based on the measurements.
a. Perimeter and area of the rectangle
b. Perimeter and area of the triangle
c. Circumference and area of the circle

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