2/5/09
Post date: Feb 05, 2009 2:44:32 AM
Bell Ringer: What changes when an acceleration occurs?
Finish section 2 notes
Acceleration Lab due Monday
Acceleration Lab Instructions
Forming Teams
Work in groups of at least 5, no more than 7 students
Decide on a job for each person, according to the descriptions on the next slide
Jobs
1. Timer for first 3 meters
2. Timer for last 3 meters
3. Timer for entire run
4. Accelerator
5. Acceleratee
6. Recorder
7. Recorder
The timers will be timing sections of a movement with acceleration. One will time only the first 3 meters, another only the last 3, and the 3rd will time from start to finish
The accelerator pushes the chair
The acceleratee sits in the chair
The recorders record data
Data to record
Be sure to record the total time, the time for the first 3 meters, and the time for the last 3 meters
Do this twice, in case your data doesn’t work out from the first trial
Calculations
Find the average speed for the entire run
Find the average speed for the first 3 meters
Find the average speed for the last 3 meters
Find the average acceleration for the entire run (assume your first speed happens at 0 seconds, and your end speed happens at the very end of your time for the run)
Analysis
Make a graph of speed vs. time for your entire run
Assume that the speed for the first 3 meters happens at t=0, and for the last 3 meters happens at the very end of your run
Connect the starting speed and ending speed with a line, and find the slope for that line
Conclusion
What are the units for the slope you found in the analysis?
What does the slope of this graph represent?
Compare the slope to the acceleration you found. Explain any relationship you find.