1. Physics 1 – Aug 26, 2016 P3 Challenge – Do Now (on slips of paper)
The dimensions of a room are given. Find the area of the room including the uncertainty in the area.
L = 15.5 m ± 0.3 m
W = 12.3 m ± 0.5 m
Get out 1.2 Worksheet for Homework check.
Pick up three things for Lab today

2. Objectives and Agenda IB 1.2 Uncertainties and Errors
Work with absolute, fractional and percentage uncertainties
Determine the error present in graphs
Agenda for IB 1.2 Uncertainties and errors
Error propagation, exponents and roots
Lab to investigate Error in Graphs
Assignment: 1) IB 1.2 Uncertainty and Errors Practice Sheet
2) Complete the Graphing Lab Error analysis.

3. Error propagation – Powers and Roots
For examples:
A =3.5 ± 0.5
B = ± 0.001
C = 1.25 ± 0.01
D = 7.1 ± 0.2
When two quantities with uncertainty are raised to a power (or rooted), their fractional uncertainties, multiplied by their exponent, add.
Ex: Q = C3
Find Q.
Find the fractional uncertainties in C.
Multiply the fractional uncertainty by the exponent to find the fractional uncertainty in Q. (For Powers and Roots, sign does not matter.)
Multiply Q’s fractional uncertainty by Q to find its ∆Q.
Why does this rule work? (Consider Max and Min possible.)
IB formula summary of this rule:

4. Exit Slip - Assignment
For Error Propagation, identify the type of uncertainty you add for…
Why do you draw a minimum slope line and a maximum slope line on a graph?
What’s Due on Tues Aug 30? (Pending assignments to complete.)
IB 1.2 Uncertainty and Errors Practice Sheet,
What’s Next? (How to prepare for the next day)
Read IB 2.1 (1 D) p35-43