1. Understanding Labs

2. Objective/Agenda  Objective: I can record and present experimental data in a neat, clear, organized manner.  Agenda  Go over lab write up format  Go over proper graphing techniques  Collect data for Circle lab  Graph data by hand  Whiteboard

3. Lab Write ups  What you need in your lab write ups  Table of Contents  Name, Date, Group Members, Page Numbers  Purpose  Materials  Procedure  Data  Evaluation of data  Conclusions

4. Purpose  Why are you doing this lab.  Example: To determine the graphical and mathematical relationship among ________

5. Materials/Apparatus  What did you use for the lab, if it is specific equipment state the name, manufacturer, and model.

6. Procedure  Write what steps you took to perform the lab  These are not instructions/directions but what you did for the lab. Ex. We measured a given length (30cm) using the meter stick and the measured a given angle (30 o )……

7. Data  Organized in a neat table with labels and units.  The tables should be titled ex. Different spheres while keeping string length at 30 cm and angles at 30 o.  The data should then follow this title

8. Evaluation of data  This should be where you graph your data  Original graphs  Linearized graphs

9. Conclusion and Errors  This is where you conclude about your results.  What did you find?  What equations did you find?  Compare to theory (will come from our class discussion)  Discuss possible sources of error  Human error is not a source, this can be eliminated fairly easily. If you know you made mistakes, do it again.

10. Graphing  What your graph should consist of  Title (dependent vs. independent)  Independent variable on horizontal axis  Dependent variable on vertical axis  Axis labeled (including units)  Line of best fit (including equation)  Proper scaling for axis starting at 0  Plotted on graph paper or using Graphing Software

12. What do you notice about the Circles?

13. What can you measure?

14. What could you do to change the circles?

15. 8x10 Rule  Must have 8 different data points that span at least a factor of 10  Example: Starting at 10cm. Factor of ten (multiply by 10) would be 100cm (10cm x 10=100cm)  I need 8 different (evenly spaced) measurement points  10, 20, 30, 40, 50, 60, 70, 80, 90, 100  Or 10, 25, 40, 55, 70, 85, 100, 115,