The distance between the ceiling and the floor (h) was measured. A rubber was then dropped from the ceiling and the time taken for it to hit the ground was recorded.
Time Taken (sec)
Average Time = Sum of all times
Number of Times
= 0.59 sec (to 2 dp)
H = height of the drop
T = time taken
Acceleration due to gravity = 2H
= 14.88 m/s2 (to 2 dp)
The results circled in the table are anomalous. There was a wide range of results, from 0.4 to 0.71. This spread of results indicates that the data may be inaccurate. Although the experiment was repeated nine times, different results were found at nearly every attempt. This could be due to the timing methods used. A stop clock held by a person was used to measure the time the rubber took to hit the ground. As a humans reaction times are not perfect, the button could have been pressed long after the rubber had touched the ground. Also, the timekeeper could have pressed the button too early; at the time he expected the rubber to fall in order to try and get a more accurate time. As the area used was not a vacuum, air resistance would have affected the results. The shape of the rubber dropped was a pyramid, so air resistance would be different dependant on the side upon which it was dropped. These reasons explain why some of the results were anomalous.
I do not believe that the procedure was accurate enough to measure the acceleration due to gravity in the lab. The timing apparatus was too imprecise and the air resistance due to the lack of a vacuum meant that the data