1. Physics 1 – Aug 29, 2017 P3 Challenge – Do Now (on slips of paper)
List the six steps for calculating a standard deviation by hand,
Get out 1.2 Worksheet for second Homework check.
2) Hand in extra credit propagation worksheet

2. Objectives and Agenda IB 1.2 Uncertainties and Errors
Determine the error present in graphs
Agenda for IB 1.2 Uncertainties and errors
Homework Review of 1.2 Practice Worksheet.
Graph Errors Overview and Practice
Graphing Lab activity start

3. 1.2 Error analysis Homework p2-4
Data Processing
1) 2.2 m
2) / g
3) a) 4.47 m/s b)
c) +/- 0.2 m/s
d) 4.5 m/s
e) 4.5 +/- 0.2 m/s
Error Propagation
1) 2.80 x 103 +/- 30 cm2
2) /- 0.2 mL
3) / m/s
4) 121 +/- 4 cm2
5) / m
Error Propagation
6) 42 +/- 5 s
7) 37 +/- 3 cm2
8) 19 +/- 2 m/s
9) 18 +/- 2 cm2 OR
18.1 +/- 1.5 cm2
10) /- 100 Ω OR /- 150 Ω

4. Graphing Error Analysis Overview
Read the y-intercepts off the graph or calculate them from the points on each line using algebra.
Find the (max – min)/2 for slope to determine the uncertainty in the best fit slope.
Find the (max – min)/2 for the intercepts to determine the uncertainty in the best fit intercept.
Write summary equation with uncertainties.
Determine the percent error, if appropriate.
Decide on IV and DV variables.
Title the graph and the two axes.
Decide on scales for both axes.
Plot points.
Draw error bars for extreme points (or all)
Draw min, max and best fit lines.
Find two points on each line.
Use algebra to find slope of each line
Animation of the process and practice

5. Exit Slip - Assignment
For Error Propagation, identify the type of uncertainty you add for…
1) Adding and subtracting
2) Multiplying and Dividing
3) How do you handle Powers and Roots?
What’s Due on Thurs Aug 31? (Pending assignments to complete.)
Graphing Lab Warmup
Complete the Video Data graph analysis
What’s Next? (How to prepare for the next day)
Read Procedure for Lab next time. (Will and Jessica, Still need Safety Contracts)