1. Physics 1 – Sept 6, 2018
P3 Challenge – Confer with anyone who has done the same standard deviation calculation as you. When you reach consensus, report your answers on the board.
Get out two standard deviation calcs for HMK check

2. Objectives and Agenda Objectives
1.2 Uncertainties and Errors
Assignment: Complete Graphing Water Density Lab
Agenda
Graphing Water Density Lab

3. Graphing Error Analysis Overview
Determine two points on each max/min line generated from the extreme point error boxes
Use algebra to determine the slope and intercept of the max and min lines
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 for the best fit line 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 best fit line.
Find two points on best fit line.
Use algebra to find slope of and intercept of the best fit line.
Draw the max and min slope lines
Animation of the process and practice

4. Graphing Lab Overview
Collect Mass and Volume Data for water for volumes of approx. 5, 15, 25, 35, 45 mL.
Record the actual volume used as accurately as possible.
Record the mass to 3 decimal places using a triple beam balance.
Share your data with the class on the board and copy all class data.
Find ave and std dev of all volume and mass data. (Divide and conquer.)
Plot points (mass vs volume) with error bars for each point reflecting std devs
Determine min/max lines to asses uncertainty in slope and intercept.
Determine best fit line with uncertainties for the density of water.
Compare results to accepted 1.00 g/mL with a % error.

5. Exit Slip - Assignment Exit slip – None.
What’s Due? (Pending assignments to complete.)
Complete the Graphing Lab Activity.
What’s Next? (How to prepare for the next day)
Read IB 1.2 p 11-20