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 Certain digit Estimated digit Certain digits Estimated digit B and C are more precise measurements

3. Worksheet on measurements Take out a ruler

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

5. -2.437.9 8.186.5 -10.534.6

6. 4.5045.0 7.4074.0 3.5035.0 4.1541.5 9.2592.5 8.7087.0 1.3513.5

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 xx x Not precise Not accurate Precise Not accurate Precise Accurate

11. Pages for Additional Reading  Page 25