# AP Lab 11.3 Archimedes Principle

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1 ame School Date AP Lab 11.3 Archimedes Principle Explore the Apparatus We ll use the Buoyancy Apparatus in this lab activity. Before starting this activity check to see if there is an introductory video in the ebook at This will give you an introduction to the use of the apparatus. You can get quick access help by rolling your mouse over most objects on the screen. Here s a busy little figure explaining what s what. Figure 1 The Buoyancy Apparatus When working with buoyant forces we need to be able to measure the weight and volume of the immersed objects and the fluid (water in this lab) displaced. A hanging scale and a digital scale are available for measuring weights. The overflow of water from the tank spills into a graduated cylinder. The volume of water displaced can be read from the graduated cylinder; and the weight of the fluid can be found by weighing the graduated cylinder before and after overflow. Two simple and two compound objects are available for study. They are composed of cork, aluminum, and an unknown material. These objects can be weighed in air and when partially or fully submerged. The hanging scale is raised and lowered by dragging the metal arm that supports it. When an object begins to enter the water, the volume of water it displaces overflows into the graduated cylinder. The weight of the water displaced can be found by weighing the cylinder before and after it s filled with overflow water. Both the hanging scale and the graduated cylinder can be read more precisely by zooming in. The graduated cylinder is emptied by releasing it above the tank. You ll find that some actions that could be done with real apparatus are forbidden. For example, if you removed the cork and aluminum object from the hanging scale and then attached a new object to the scale, you d find no further overflow is possible without first emptying the cylinder. Similarly, you can t weight more than one object on the digital scale at a time. And you can t make a mess by lowering an object into the water while the cylinder is on the digital scale. The rod holding the hanging scale just won t move. AP Lab 11.3 Buoyancy 1 ovember 10, 2011

2 Theory Archimedes Principle Archimedes Principle is very easy to state in words, but learning how to use it takes practice in a variety of situations. In this lab we ll first explore the literal meaning of this principle. Then we ll put it to use in a couple of situations. You ll use the wording of the principle to draw free-body diagrams (FBDs) and create equations that can be used to find unknown quantities such as the volume, mass or density of an object of the fluid it s immersed in. Archimedes Principle: A body wholly or partially immersed in a fluid will experience a buoyant force equal to the weight of the fluid displaced. Without a bit more information, this is not much more than magical incantation! Just what is the source of this buoyant force? 2a 2b 2c 2d 2e 2f Figure 2 Pressure vs. Depth in a Fluid In Figure 2 we see a solid cylinder being gradually lowered into a tank of fluid. Let s assume that the solid cylinder is wood and the fluid is water. The gauge pressure at any point a distance h below the top surface of the water equals ρ water g h. This pressure acts in all directions but we are only concerned with the pressure at the top and bottom of the wooden cylinder. We can ignore horizontal pressures since at any depth the pressure is the same, so each side of the cylinder will experience the same pressure. Thus there will be no net horizontal pressure. In Figure 2a the cylinder is surrounded by air on all sides. The air pressure on the bottom will be slightly greater than that on the top, but it would be insignificant. We ll ignore this slight effect. In 2b, the bottom of the cylinder is submerged. The downward pressure on the top is again atmospheric, P atm. The upward pressure on the bottom is P atm + the gauge pressure, the pressure due to the column of fluid. AP Lab 11.3 Buoyancy 2 ovember 10, 2011

3 Replacing top and bottom with the more general 1 and 2, the pressure difference between the top and bottom is ΔP = P 2 P 1 = the gauge pressure, ρ g h. (ote: P 2 and P 1 refer to P up and P down respectively.) P 2 = ρ w g h 2 Equation 1 As a result there is an upward buoyant force, F buoy, equal to this pressure times the top surface area. F buoy = P 2 A Equation 2 In Figure 2c, P 2 is larger due to the greater depth, thus F buoy is proportionally larger. This buoyant force will continue to increase as more of the cylinder is submerged until Figure 2d where the maximum ΔP is achieved. In Figure 2e, P 2 is larger than in 2d, but there is now a P 1. otice the ΔP arrow in 2d 2f. It remains the same because each increase in P 2 is matched by an equal increase in P 1. So a more general statement than Equation 2 is F buoy = ΔP A F buoy = (P 2 P 1 ) A F buoy = ρ g (h 2 h 1 ) A Equation 3 Figure 4 The origin of the buoyant force should make sense now, but what about the weight of the fluid displaced? The weight of the fluid now occupied by the cylinder = m cylinder g. Using ρ = mass/volume we can replace the mass with ρ volume. And the volume of the cylinder is the area of its base times its height. Hence, Weight of cylinder = weight of fluid displaced = ρ g V = ρ g (h 2 h 1 )A This actually applies to object of any shape but we ll omit that derivation. So the buoyant force makes sense in terms of the difference in pressure and area. And further examination tells us that this same ΔP A equals the weight of the fluid displaced. We can also understand it from another direction by realizing that when water fills the same volume, it must have an upward force equal to its weight. Otherwise it would not stay at rest. Any other object inserted in the same volume would experience the same force because the same pressures would be present. Archimedes Principle and other forces. Most of our work with this principle includes additional forces. The submerged body itself has a weight which opposes the buoyant force. A string might be pulling upward or downward on a submerged body. We ll refer to the force it exerts as the apparent or submerged weight, W. This is an upward force. The buoyant force might be used to partially or fully support another object. For example a life jacket has to supply enough buoyant force to support itself as well as the person wearing it. These situations are generally dealt with using the tools of translational equilibrium. That is, if a body is in equilibrium, the sum of the forces in any direction will equal zero. A buoyant force is just another force. Just as important, a careful free-body diagram, FBD, is essential in working out what object(s) are involved as well as all forces involved. AP Lab 11.3 Buoyancy 3 ovember 10, 2011

4 Example 1. A steel anchor weighs 2000 in air. How much force would be required to support it when submerged in water? That is, what is its apparent weight, W, when submerged? Remember, W is an upward support force. There is an upward support force, W, an upward buoyant force, F b, and the downward gravitational force, that is, its weight, W. The sum of these equals zero. So, F b + W = W Other considerations: F b = weight of fluid (water) displaced = ρ water g V water = ρ water g V anchor since the anchor displaces an equal volume of water. And since we know the weight and mass of the anchor we can find its volume by looking up its density and using ρ steel = m anchor V anchor Figure 5 Procedure A. Confirm Archimedes Principal for ρ object > ρ liquid using overflow Archimedes Principle: A body wholly or partially immersed in a fluid will experience a buoyant force equal to the weight of the fluid displaced. In this section we ll directly measure the buoyant force and the weight of the water displaced and confirm that they are equal. Our object will be an aluminum disk. Figure 6a 6b 6c 6d AP Lab 11.3 Buoyancy 4 ovember 10, 2011

5 Weighing the aluminum disk in air (Fig. 6a) gives us W. Weighing it when submerged (6c) gives us W. From our FBD we can say that F buoyant + W = W, so F b = W W Equation 4 Weighing the empty graduated cylinder (6b) gives us W cyl. Weighing the cylinder after receiving the overflow water (6d) gives us W cyl + water displaced. Logically, F b = W water displaced = (W cyl + water displaced ) - W cyl Equation 5 6e 1. Using your apparatus, collect and record the data below. W al = W cyl = W al = W cyl + water = 2. Calculate the buoyant force, F b. twice, using Equation 4, and Equation 5. F b = (Equation 4) F b = (Equation 5) % difference = % Show your calculations of F b for each method and the percentage difference. AP Lab 11.3 Buoyancy 5 ovember 10, 2011

6 B. Confirm Archimedes Principal for ρ object < ρ liquid using overflow In this section we ll directly measure the buoyant force and the weight of the water displaced and confirm that they are equal. Our object will be an cork disk. This time you fill in all the missing pieces. Sort of like the kids menu at Waffle House. Fill in all the blanks including the spaces for Equation 6. Also finish Figures 7a, c, d, and e. Figure 7a 7b 7c 7d Weighing the cork disk in air (Fig. 7a) gives us W. Weighing it when submerged (7c) gives us W. But it floats so W = From our FBD we can say that Equation 6 Weighing the empty graduated cylinder (7b) gives us W cyl. Weighing the cylinder after receiving the overflow water (7d) gives us W cyl + water displaced. Logically, W water displaced = (W cyl + water displaced ) - W cyl Equation 7 7e (FBD) Using your apparatus, collect and record the data below. W cork = W cyl = W cork = W cyl + water = 2. Calculate the buoyant force, F b. twice, using Equation 6, and Equation 7. F b = (Equation 6) F b = (Equation 7) % difference = % AP Lab 11.3 Buoyancy 6 ovember 10, 2011

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