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Aim: How do we record measurements?

Aim: How do we record measurements?. Do Now: Record the measurements of A, B, and C. 0 A 1 2 B C 3. Rule : State the digits that you know for certain and estimate one extra digit. This shows the precision of your measuring instrument.

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Aim: How do we record measurements?

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  1. Aim: How do we record measurements? Do Now: Record the measurements of A, B, and C 0 A 1 2 B C 3

  2. Rule: State the digits that you know for certain and estimate one extra digit. This shows the precision of your measuring instrument. Acceptable answers to the do now: A – 0.2 0.3 0.4 B – 2.26 2.27 2.28 2.29 C – 2.80 Estimated digit Certain digits B and C are more precise measurements Certain digit Certain digits Estimated digit Estimated digit

  3. Worksheet on measurements Take out a ruler

  4. 12.01 12.51 9.71 11.30 13.26 12.97 14.34 13.94 11.72 10.31

  5. -2.4 37.9 -10.5 34.6 8.1 86.5

  6. 4.50 45.0 7.40 74.0 3.50 35.0 4.15 41.5 9.25 92.5 8.70 87.0 1.35 13.5

  7. Uncertainties in Measurements • In devices: • A metal ruler’s length can change with changes in temperature • Electric devices can be affected by magnetic fields near them • With People: • Reading an instrument from an angle (not at eye level) could result in incorrect readings

  8. Parallax – the apparent shift in the position of an object when it is viewed from various angles Precision – the degree of exactness to which a measurement can be reproduced - limited to the smallest division on the scale of the instrument Accuracy – how well the result agrees with an accepted value

  9. Describe the dart player’s throws: x x x x x x x x x Precise Not accurate Not precise Not accurate Precise Accurate

  10. Pages for Additional Reading Page 25

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