1. Measurement: Errors, Accuracy, and Precision

2. August 17, 2011 HW: Physics to Go (PTG)-pg. 32, #6-9  Do Now (NB pg. 6)  WDYS & WDYT-  TB pg 22  Success Criteria  Calibrate the length of a stride  Measure a distance by pacing it off and by using a meter stick  Identify sources of error in measurement  Evaluate estimates of measurements as reasonable or unreasonable  Complete various metric conversions  Agenda:  Do Now  1.2 Measurement: Errors, Accuracy, and Precision  Physics Talk  Metric Mania  Homework:  PTG, pg. 32, #6-9

3. Investigate pg. 23-24  In your notebooks: READ ENTIRE INVESTIGATE  Turn all questions (1-8) with pencils next to them into statements in your notebook  Do 1-8 in your notebooks

4. Example:  For 2a you will put the statement in your notebook as:” The number of strides is__________.”  For 3a you will put in your notebook “The measurement is___________.”  For 4a you will put in your notebook” The calculations are___________.”

5. Materials  After turning all of the text (where pencil is at #s 1-8)from the book into statements.  Check off with Mr. LePera and pick up a meter stick  Mr. LePera has taped off the distance for you in the hallway.  Keep in mind…..Disruptions in the hallway will cause your group to do the work inside the classroom, and outside classroom privileges will be revoked!!!  Do your lab in the hallway and finish in the classroom.

6. HW: Finish PTG #6-9  Do Now (below data for 1.2 in notebook):  What is the difference between a systematic error and a random (human) error?  In your groups answer #9 on TB pg. 24 in your notebooks, be prepared to share out

7. Physics Talk  What are Random Errors?  Produced by measuring tools and human mistakes  Cannot be corrected by calculations  Can never be eliminated

8. Physics Talk  What are Systematic Errors?  Can be avoided  Corrected by calculations  Example: If I accidentally measured in inches, when I was supposed to measure in centimeters, I could convert to get the right numbers

9. Physics Talk  What is accuracy?  What is precision?  How close to an accepted value  Example: Shooting on goal in soccer  Frequency of results  Always hit close to the same spot  Example: Always missing wide right when shooting the ball in soccer

10. Metric Conversions Ladder Method T. Trimpe 2008 http://sciencespot.net/

11. August 17, 2011 HW:PTG pg. 32 #6-9  Do Now: In your notebook (below notes) answer the following:  WDYTN? TB Pg. 30  Reflecting on the Section Challenge: TB pg. 31  How will what you learned in 1.2 help you with your chapter challenge (pg. 3)  Success Criteria  Calibrate the length of a stride  Measure a distance by pacing it off and by using a meter stick  Identify sources of error in measurement  Evaluate estimates of measurements as reasonable or unreasonable  Complete various metric conversions  Agenda:  Collect Metric Mania  Do Now  Success Criteria  PTG pg. 32 #6-9

12. Quiz 1.2