DISCOVER
Experiment Analysis
Observations
Write down your observations of how the velocity
and acceleration of the bob in the film vary with time and distance
from where it was dropped initially. Don't be overly concerned if you
find the task difficult; in fact, one of our purposes here is to show
how important mathematical modeling and analysis are in interpreting
and understanding observations and in using that information for
prediction.
Experimental Data
The location of the bob every sixtieth of a second
during its fall has been converted into a table of data (
Table 1) showing the time variation of the
velocity and acceleration of the bob.
To supplement these data we
need some additional information.
Mass of the bob |
= 0.1427 kg
|
Drag coefficient |
= 6.07 x 10-4 Ns2/m2
|
Diameter |
= 0.0317 m
|
Characteristic area |
= 7.892x10-5 m 2
|
Air density |
=1.205 kg/m3
|
Air viscosity |
= 1.81 x 10-5 Ns/m2
|
The drag coefficient was obtained from
measurements in a wind tunnel.
Go on to the applications section to perform an
analysis of this data.
Copyright
1998-1999
Rensselaer Polytechnic Institute. All Rights Reserved.