|
We dropped six pebbles into a graduated cylinder filled with
water to a height of 18.5 cm. We timed each descent. We repeated
the experiment with corn syrup instead of water.
|
Time it takes, in seconds, for a pebble to sink through a liquid
|
| Trial |
water |
corn syrup
|
| 1 |
0.38 seconds |
49.60 seconds |
| 2 |
0.31 seconds |
59.68 seconds |
| 3 |
0.40 seconds |
66.16 seconds |
| 4 |
0.42 seconds |
50.25 seconds |
| 5 |
0.47 seconds |
54.35 seconds |
| 6 |
0.34 seconds |
55.50 seconds |
| |
|
|
| Average |
0.39 seconds |
59.92 seconds |
There was some variation from one pebble to the next in each
liquid, but the time to reach the bottom of the water was
much faster than in corn syrup, an average of .39 seconds
in water as compared to an average of 59.92 seconds in corn
syrup. Corn syrup has a higher viscosity than water.
-
Repeat this experiment with different liquids. Try various
kinds of vegetable or mineral oil, honey, and alcohol.
- In our experiment the liquids were at room temperature.
Compare water and corn syrup, but cool each liquid in a
refrigerator for about 15 minutes before the experiment.
Then try using warm corn syrup and water. You can warm the
corn syrup by immersing the graduated cylinder in a pot
of warm water for about 15 minutes. Also use that same water
for the experiment.
|
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