Experiment 3: Buoyant

Force and Archimedes Principle

Data Tables and Post-Lab Assessment

Table 2:Dimensions of 250 g

Hanging Mass

Base Edge (cm)

Height (cm)

Table 3: 250 g Hanging

Mass Buoyancy Data

Object

Weight in Air (N)

Weight in

Water (N)

Buoyancy Force (N)

Volume

Displaced (mL)

250 g

Hanging Mass

Rubber

Stopper

Post-Lab Questions

1. What happens to the apparent weight when the objects are

submerged in water?

2. Use the value of the buoyant force to calculate an

experimental value of the volume of all of the objects in kg/m3 (Fb

=ρLVD

g). Show your work.

3. .png”>Use the measured dimensions of the 250 g mass to calculate

the volume of the mass, Show your work.

4. Determine the percent difference between the measured

volume of the 250 g mass and the value calculated from the buoyant force

measurement. Show your work.

5. Using the fact that 1 mL = 1 x 10-6 m3,

compare the volume of the displaced water to the calculated volume of the mass

from Post-Lab Question 3 with a percent difference calculation. Show your work.

6. Are the three experimental values of the volume of the 250

g mass (from Archimedesâ€™ Principle) larger or smaller than the calculated value

using the caliper measurements? Why? Which of the three values for volume is

more accurate? Which of the two experimental volumes are more accurate?

Explain.

7.

Use the experimental

weight and volume of the rubber stopper to calculate the density of the stopper

in kg/m3 using the equationρ = m/v. Show your work.

8. Research the density of rubber stopper on the internet and

compare your measured value of the density with the values listed online.

9. Does the data support Archimedesâ€™ Principle? Why or why

not?

10. Identify two possible sources of error in the experiment?

How could the procedure be revised to remove these potential errors?

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