"Archimedes Principle" explains buoyancy, which is the subject of this second experiment. The student will find that different liquids have different buoyancy. See the last post for an experiment that lays the ground work for this one.
Name of the Experiment: The Buoyancy Experiment
Performed by:________________________________________
Date:_________________________________________
The Problem: Objects seem lighter in liquids. Some objects even float. This apparent loss of weight is called buoyancy. How does the buoyancy of different liquids compare?
The Hypothesis:
The Experiment: You will need: two large bowls, a glass custard cup or small bowl, pennies, salt, and 1 gallon of water. Fill one large bowl with about 2 quarts of water. Float the glass custard cup in the large bowl and add pennies until the cup sinks. The pennies must be added one at a time in such a way that the cup does not tilt to one side. Record the number of pennies on the chart below. Next, remove the cup and dry the cup and pennies. In the second large bowl, add 1 cup of salt to about 2 quarts of water. Stir until dissolved. Float the cup and add pennies until the cup sinks. Record the number of pennies for the salt water. Repeat the experiment two more times to check your results.
Observations:
--------------------------------------------Trial A------Trial B-----Trial C
Number of Pennies to Sink in the Water: ________ ________ ________
Number of Pennies to Sink in Salt Water: ________ ________ ________
Interpretation:
Conclusion:
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