Physics Lab 11 - Virtual Force Buoyancy Lab NG PDF

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Force Buoyancy Lab Force Buoyancy Lab

Purpose: In this activity you will be learning the factors that affect the force of buoyancy on an object in a fluid.

Information: 

Your force buoyancy will be equal to the difference between the weight of your object in air and the "apparent weight" of your object in a fluid.



Setup



Forces. Give a picture and the equations for the bottle underwater.

Fb =m f g= ρf Vg

Procedure Force Buoyancy vs. Fluid Density

1.

Open the program found here and set the fluid to Gasoline.

2.

Make sure you start your experiment on the Earth with a volume of 100 mL and a mass of 2000 grams.

3.

Start the first trial and allow the 16 seconds to elapse and then get a reading for the force when it was in the air and the force when it was in the fluid. Subtract these forces to get the force of buoyancy.

a)

Keeping the same mass, increase the volume by approximately 200 mL. Repeat the experiment

b) Run at least five trials. Set up a data table for Force Buoyancy vs Volume. Graph using a graphing utility

Water Force in Air (N) Force in Fluid (N) 19 18 16 14 13

1 2 4 6 7

Water Buoyancy (N) 100 302 403 502 600

Bottle Volume mL 19 18 16 14 13

Density of liquid 391.83 kg/m3

Percent error: 39.08%

Water 600 500

Bottle Volume (mL)

c)

400 300 f(x) = 3.85 x + 246.02 200 100 0

0

1

2

3

4

Buoyancy (N)

5

6

7

8

Mercury Force in Air (N) 20 20 20 20 20

Force in Fluid (N) 6 0 0 0 0

Mercury Buoyancy (N) 14 20 20 20 20

Bottle Volume mL 100 306 405 503 600

Density of liquid 3460.21 kg/m3

Percent error: 34.59%

Mercury 600

Volume mL

500 400 300

f(x) = 33.92 x − 374.83

200 100 0 13

14

15

16

17

Buoyancy (N)

18

19

20

21

Gasoline Gasoline Force in Air (N) 20 20 20 20 20

Force in Fluid (N) 19 17 16 15.5 15

Buoyancy (N) 1 3 4 4.5 5

Bottle Volume mL 100 302 402 501 600

Density of liquid 737 307.14 kg/m3

Percent error: 30.61%

Gasoline 600

Volume (mL)

500 400 300

f(x) = 30.1 x + 155.65

200 100 0 0.5

1

1.5

2

2.5

3

3.5

Buoyancy (N)

4

4.5

5

5.5

Maple Syrup Maple Syrup Force in Air (N)

Force in Fluid (N) 20 20 20 20 20

18 15 14 13 11

Buoyancy (N)

Bottle Volume mL

2 5 6 7 9

100 301 400 501 60

Density of liquid 753.97 kg/m3

Percent error: 65.39

Maple Syrup 700 600

f(x) = 73.9 x − 48.19

Volume mL

500 400 300 200 100 0

1

2

3

4

5

6

Buoyancy (N)

7

8

9

10

Crude Oil Crude Oil Force in Air (N) Force in Fluid (N) 20 19 20 17 20 16 20 15 20 14

Buoyancy (N)

Bottle Volume mL

1 3 4 5 6

100 305 404 505 600

Density of liquid 825 kg/m3 1022.34 kg/m3

Percent error: 102.1%

Crude Oil 700 600

f(x) = 100.19 x + 2.08

Volume mL

500 400 300 200 100 0

0

1

2

3

4

Buoyancy (N)

5

6

4.

Repeat on each of the other fluids available to you in this program. Do not make changes to any other parameter. Repeat parts a – c. From your graphs, determine the slope of each Force Buoyancy vs Volume data set. Using the equation for Buoyant force at the start of this lab write up, determine the density of the fluid. Compare to the densities given in the table above. Calculate the Percent Error for your experimental values.

What You Will Turn In: 1. Snipped picture of Lab Setup 2. Snipped picture of Force vs Time Graph 3. Data Tables of Force Buoyancy and Volume for each fluid. 4. Graph of Force Buoyancy vs Volume for each fluid showing slope. 5. Calculation of the fluid density from your slope value. 6. Percent Error for the experimental value for each fluid....