Mass, Volume, & Density Lab
Archimedes’ Principle Lab
The relationship between the buoyant force on an object immersed in a fluid and the weight of the fluid that is displaced by that immersed object is known as Archimedes’ Principle (Archimedes of Syracuse, Greek, c. 287BC – c. 212BC). In this activity, you will find and state this relationship.
1. Fill a beaker with water until it is just about to overflow. Immerse a sinkable object in the beaker capturing the water that over flows.
2. Determine the weight of the water that overflows in newtons using a scale and the relationship W = mg where mass is expressed in kilograms and g is 9.8m/s2. Write the weight of the water in newtons below. Show your calculations.
3. Calculate the expected buoyant force on the sunken object using the relationship found earlier, FB = (Vg. Show your work.
4. Express in own words the relationship between the buoyant force on an object immersed in a fluid and the weight of the fluid that is displaced.
This relationship – properly expressed – is known as Archimedes’ Principle. It works equally well for sinking and floating objects.
Do you understand why this principle holds? Note that (V = m and W = mg. The statement of FB = (Vg is nothing more than a mathematical expression of Archimedes’ Principle.
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