PASCO ME-8569 DENSITY SET - Manual (Page 13)

scientific 9
012-04774A
3. While the object is still hanging from the balance,
submerge the object in a beaker of water so that the entire
object is under water but it is not touching the sides or
bottom of the beaker. Record the reading on the scale and
multiply by gravity to get the apparent weight. Record in
Table 3.2.
4. Calculate the buoyant force by taking the difference
between the weight in air and the weight in water. Record in
Table 3.2.
5. Repeat these steps for all the objects. Note that the
plastic cylinder will float so don’t try to completely sub-
merge it in the water. Also, for the half-submerged brass
cylinder, find the apparent weight in the water when only
half the cylinder is submerged.
QUESTIONS
1. In each case, is the buoyant force found using the
difference between weights equal to the weight of the water
displaced?
2. Which objects had the same buoyant force when sub-
merged?
Why?
3. For the plastic cylinder, what was the weight in water?
4. How was the buoyant force for the totally submerged
brass cylinder related to the buoyant force for the half-
submerged brass cylinder?