Measurement: Errors, Accuracy, and Precision
PHYSICS CHAPTER 1, SECTION
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
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?
 How close to an accepted
 What is precision?
 Frequency of results
 Always hit close to the
value
 Example: Shooting on goal
in soccer
same spot
 Example: Always missing
wide right when shooting
the ball in soccer
Metric
Conversions
Metric Conversions
Ladder
Method
Ladder Method
T. Trimpe 2008 http://sciencespot.net/
T. Trimpe 2008 http://sciencespot.net/
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
Quiz 1.2