the Knock on the Door
the Knock on the Door
This resource, part of the Open Door website, provides basic information on the role of measurement in experimentation. It explores methods for measuring very small distances, graphing experimental results, "best-fit" line, and explores the role of uncertainty in measurement. For the teacher who expects students to do experimental or quasi-experimental lab work, this resource provides support in graphing results, writing an experimental report, and how uncertainty in measurement affects the final results.
6-8: 9B/M3. Graphs can show a variety of possible relationships between two variables. As one variable increases uniformly, the other may do one of the following: increase or decrease steadily, increase or decrease faster and faster, get closer and closer to some limiting value, reach some intermediate maximum or minimum, alternately increase and decrease, increase or decrease in steps, or do something different from any of these.
6-8: 9D/M4. Comparison of data from two groups should involve comparing both their middles and the spreads around them.
6-8: 9D/M5. The larger a well-chosen sample is, the more accurately it is likely to represent the whole. But there are many ways of choosing a sample that can make it unrepresentative of the whole.
12. Habits of Mind
12B. Computation and Estimation
9-12: 12B/H9. Consider the possible effects of measurement errors on calculations.
12C. Manipulation and Observation
6-8: 12C/M3. Make accurate measurements of length, volume, weight, elapsed time, rates, and temperature by using appropriate devices.
12D. Communication Skills
6-8: 12D/M1. Organize information in simple tables and graphs and identify relationships they reveal.
6-8: 12D/M4. Understand oral, written, or visual presentations that incorporate circle charts, bar and line graphs, two-way data tables, diagrams, and symbols.
6-8: 12D/M6. Present a brief scientific explanation orally or in writing that includes a claim and the evidence and reasoning that supports the claim.
%0 Electronic Source %A Knock on the Door, %D September 9, 2007 %T Open Door Website: Measurements %V 2014 %N 21 April 2014 %8 September 9, 2007 %9 text/html %U http://www.saburchill.com/physics/chap03.html
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