PHYSICS CHAPTER 1, SECTION 2

Measurement: Errors, Accuracy, and Precision

August 17, 2011HW: 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

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

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___________.”

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.

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

Physics Talk

What are Random Errors?

Produced by measuring tools and human mistakes

Cannot be corrected by calculations

Can never be eliminated

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

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

Metric Conversions Ladder Method

T. Trimpe 2008 http://sciencespot.net/

Metric Conversions Ladder Method

T. Trimpe 2008 http://sciencespot.net/

August 17, 2011HW: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

Quiz 1.2