course Phy121
I know this experiement wasn't required, but I wanted to send it anyway.
Your work has been received. Please scroll to the end of the document to see any inserted notes (in boldface) and a note at the end. The note at the end of the file will confirm that the file has been reviewed; be sure to read that note. If there is no note at the end, notify the instructor through the Submit Work form, and include the date of the posting to your access page.
I know this experiement wasn't required, but I wanted to send it anyway. " "This is the design of the experiment, Class Notes #1. I took a 16 cm wooden board, elevated it by a book, underneath its right side. I placed a 1” metal ball at the top of the ramp, secured by an eraser. This ball was placed 1cm from the edge, so the ball was rolling down 15 cm of board. I marked off the middle of this board at at 7.
I did a few practice runs to ensure consistency in my timing. I started the timer the moment my hand released the ball (removed the eraser), then clicked on the timer once again when the ball hit the 7.5 cm mark, and then lastly when it hit the bottom of the ramp. In this instance, the ball was stopped at the bottom by a sand-filled tape dispenser. I conducted 10 trials and compared the times for the first ½ of the journey, then the 2nd half. The table below illustrates my results.
This is the order of the data:
Interval|Time 1st Half|Avg. Velocity cm/sec 1st Half|Time 2nd Half|Avg. Velocity cm/sec 2nd Half
1 0.8125 9.23 0.1875 40.00
2 0.6875 10.91 0.2188 34.28
3 0.7813 9.59 0.2188 34.28
4 0.6719 11.16 0.2344 32.00
5 0.7188 10.43 0.2344 32.00
6 0.8750 8.57 0.2656 28.24
7 0.7656 9.80 0.2344 32.00
8 0.7969 9.41 0.2500 30.00
9 0.6875 10.91 0.2031 36.93
10 0.7656 9.80 0.2031 36.93
Determine as closely as possible the ratio of the average velocity on the lower half to that on the initial half.
Based on the numbers above, the ratio of the average velocity on the lower half to that of the intial half is: 33.67cm/sec / 9.98 cm/sec or 3.37.
Excellent. Your experiment is well designed, your data look very good and your result is within reasonable experimental uncertainty of the ideal result.
With your permission I'd like to post this, with or without your name (your choice), at a general access site for your course.
Class Notes #2
How does the shape of the corresponding position vs. clock time graph, with its upward curvature, show us that the time required to travel the first half of the incline is greater than that required to travel the second half?
As we increase the time, going from 1 second to 4 seconds, the displacement increases. At 1 second, it's 1 meter, at 2 seconds, it's 4 meters, as 3 seconds it's 9 meterrs. It is taking less and less time to cover more distance. "