Achimedes principle


Getting Familiar

  1. On the Intro screen, mess with the apparatus, changing the blocks and fluids.

Lab Setup

  1. There are 5 different fluids to choose from in the lab and five different types of materials. (Styrofoam, wood, ice, brick and aluminum)
  2. Use the table supplied to organize your work.

Lab Procedure:  Part 1

  1. In each of the scenarios below, determine first, by predicting, whether the object will sink or float.  Use a volume of 1mˆ3.
  2. Test each object once you have predicted and record the results.

Part 1:  Write an “S” for sink or an “F” for float.  Predictions first!!

 AirGasolineOlive OilWaterHoney

Archimedes principle


Force diagram of 2 objects submerged in a fluid. There is a vertical component of the force facing down which is the weight and a vertical up component which is the buoyancy forceFluids are generally thought of as liquids; however, this is a common misconception. A fluid is anything that can flow, which includes gasses as well as liquids. When an object is submerged in a fluid, it experiences an upward buoyant force Fb that opposes gravitational force Fg. This is the reason ice floats on the top of water, and a balloon filled with helium rises in air. If we define Fg in the negative direction, a submerged object will rise in the fluid if the net force is positive (the condition of ice rising in water, or a helium balloon rising in air), and sink if it is negative (the condition of a rock sinking in a pond).

The magnitude of the gravitational force acting on an object is proportional to its mass, but it is easily observable that the buoyant force acting on a submerged object is not proportional to the object’s mass: a small rock may have the same mass as a tennis ball, but a tennis ball floats in water and the rock does not. So, what is different between these two objects? Their masses may be the same but their volumes are different, and so is the volume of water displaced by each once submerged.

In this activity you will explore the relationship between the buoyant force acting on an object and the volume of fluid displaced by the object, and draw conclusions that help establish the mathematical relationship between buoyant force and a) the volume of the submerged object, and b) the weight of the fluid displaced by the submerged object.

Data Analysis

Watch the video in this link (if that doesn’t work, here) and collect the following data:

Part 1 – Brass Cylinder

Brass cylinder length (cm): 
Brass cylinder radius (cm): 
Brass cylinder area Acyl (cm2): 

Table 1: Buoyant force and displacement values for a brass cylinder submerged in a fluid                                

1/4l  FT2    
1/2l  FT3    
3/4l  FT4    
l  FT5    

Part 2 – Aluminum Cylinder

Aluminum cylinder length (cm): 
Aluminum cylinder radius (cm): 
Aluminum cylinder area Acyl (cm2): 

Table 2: Buoyant force and displacement values for an aluminum cylinder submerged in a fluid                       

1/4l  FT2    
1/2l  FT3    
3/4l  FT4    
l  FT5    
  •        Calculate the following using the measured values for each cylinder. Record the results into or above each cylinder’s respective table.

a.  The depth in centimeters in Tables 1 and 2 using cylinder length l.

b.  The cross-sectional area A, in cm2, of each cylinder using radius r.


c.  The volume of the cylinder submerged Vsubm, in cm3, at each depth.


  • If the tension FTn measured when each cylinder was submerged is equal to the difference between the gravitational force and the buoyant force:


and the tension FT1 measured when each cylinder was suspended above the water is equal to the gravitational force:


then the buoyant force on each cylinder is equal to:

    Fb=FTl−FTnFb=FTl-FTn                                                                                                     (1)

For both cylinders, use Equation 1 to calculate the buoyant force Fb at each depth. Record the results into each cylinder’s respective table.

Analysis Questions

  •   What type of mathematical relationship (proportional, squared, inverse, inverse squared, et cetera) between buoyant force and submerged volume is implied by your data?
  • The buoyant force Fb acting on an object that is partially or completely submerged in a fluid is described by the equation:

Fb=ρVgFb=ρVg                                                                                                                  (2)

where V is the submerged volume of the object and ρ is the density of the fluid in which the object is submerged. 

From your data, knowing the volume, the force, and gravity (9.8m/sˆ2) what is the value of density (ρρ) that you obtained? How does this value compare to the real value of the density of those materials?

Research Paper 101
Calculate your paper price
Pages (550 words)
Approximate price: -

Reasons to trust Research Paper 101

On Time Delivery

We pride ourselves in meeting the deadlines of our customers. We take your order, assign a writer but allow some more time for ourselves to edit the paper before delivering to you. You are guaranteed a flawless paper on a timely manner...

24x7 Customer Live Support

Our team at Research Paper 101 is committed to handling your paper according to the specfications and are available 24*7 for communication. Whenever you need a quick help, you can talk to our writers via the system messaging or contact support via live chat and we will deliver your message instantly.

Experienced Subject Experts

Online Experts from Research Paper 101 are qualified both academically and in their experiences. Many are Masters and Phd holders and therefore, are qualified to handle complex assignments that require critical thinking and analyses...

Customer Satisfaction

We offer dissertation papers as per students’ wishes. We also help craft out the best topics and design concept papers. By ordering with us, you are guaranteed of defending and making through those hard faced professors in the defense panel!

100% Plagiarism Free

We at Research Paper 101 take plagiarism as a serious offence. From the start, we train our writers to write all their papers from scratch. We also check if the papers have been cited appropriately. Our website also has a tool designed to check for plagiarism that has been made erroniusly. In essense, the paper you get will be 100% legit...

Affordable Prices

We understand that being a student is very challenging, some students balance between work and studies in order to survive. We therefore offer pocket friendly rates that are very competitive in the market.

Try it now!

Calculate the price of your order

Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.


Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.


Admission Essays & Business Writing Help

An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.


Editing Support

Our academic writers and editors make the necessary changes to your paper so that it is polished. We also format your document by correctly quoting the sources and creating reference lists in the formats APA, Harvard, MLA, Chicago / Turabian.


Revision Support

If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.