1. IB Graphing

2. Usually give graphical data display because: See relationship btw variables (increasing, decreasing or none). See outliers from data. Determine function. Finding physical constants from slope and intercepts.

3. Error Bars When measurement expressed with absolute uncertainty - graph with error bars. Bars show absolute uncertainty in individual measures. Error bar is sketched as vertical and horizontal lines beginning at data point ending in horizontal line or cap. Bar length is scaled to the graph axis. Line or curve must touch some portion of bar.

4. time (s)±0.01* Error bars too small to show at this scale distance (m) ±0.5 Error bars

5. Some error bars are different lengths why? Different instruments Calculated deviation from mean for each.

6. How to graph by hand Label Graph axes with units. Scale – large take up most of page. Plot dots w/bars. Line or curve of best fit by hand or with ruler. Should touch error bars. Best fit straight line may or may not pass through origin. Transform/Linearize curves. Calculate slope & slope uncertainty for linearized graph. Those are physical constants. Slope points – far apart and shown on line. Intercepts are constants (or offset errors).

7. Hooke’s Law Example

8. Graph with error bars & fit line

9. Types of Graphs We generally use line graphs.

10. Graph Analysis Linear Proportion y = mx + b Test: y/x = k any 2 points

11. What graph is this? Y = -kx + b (intercept) This is a linear graph!

12. Inverse hyperbolic Y = k/xtest: yx = k Transform/linearize graph by plotting y against 1/x to get linear.

13. Parabolic Y = kx 2. y/x 2 = k Or transform graph y against x 2 make it linear What will the slope be?

14. What graph is this?

15. Hooke’s Law data Make graph with error bars Force ± 5 N100150200250300 Stretch ± 0.2 cm3.04.46.27.59.1

16. Craters DBQ

17. Bozeman – Beginners to Graphing 10 min. http://www.youtube.com/watch?v=9BkbYeTC6Mo&list=PLllV waZQkS2omBpLjQm_BAQKsQ7lq86ku&index=4 http://www.youtube.com/watch?v=9BkbYeTC6Mo&list=PLllV waZQkS2omBpLjQm_BAQKsQ7lq86ku&index=4 Bozeman Graphing by hand instructions 6 min. http://www.youtube.com/watch?v=GUYRMdcEs00&list=PLllV waZQkS2omBpLjQm_BAQKsQ7lq86ku http://www.youtube.com/watch?v=GUYRMdcEs00&list=PLllV waZQkS2omBpLjQm_BAQKsQ7lq86ku Bozeman Graphing Excel Spreadsheet 5 min. http://www.youtube.com/watch?v=yvYvHU83_6Y&list=PLllVw aZQkS2omBpLjQm_BAQKsQ7lq86ku http://www.youtube.com/watch?v=yvYvHU83_6Y&list=PLllVw aZQkS2omBpLjQm_BAQKsQ7lq86ku Film Clips

18. Craters DBQ Strobe Ball Drop Do Kerr pg 21 ex 1.2.