Archimedes' Principle and Density, Lecture notes of Advanced Physics

Download Archimedes' Principle and Density and more Lecture notes Advanced Physics in PDF only on Docsity! 16e-Buoyancy - 1 - Archimedes’ Principle and Density Introduction The purpose of this experiment is to investigate Archimedes' principle for an object that is more dense than water and an object that is less dense than water. Equipment Triple Beam Balance + Thread Large Glass Beaker Styrofoam Cup Lab Jack Overflow Can Digital Lab Scale Three Objects: Sinkers (2); Wood or Cork (1) Theory Archimedes' principle states that an object floating or fully immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the object. The buoyant force on an object immersed in a liquid can also be determined by weighting an object in air and then in water. The apparent loss of weight of the object is equal to the buoyant force of the water. To summarize: Buoyant force on the object = apparent loss of weight of the object = Weight of object in air –“Weight” of object in fluid Buoyant force on the object = weight of displaced liquid 16e-Buoyancy - 2 - Procedure: Note: We will use grams as "force" units. Part 1 - Determine the buoyant force on samples more dense than water. Measuring the Apparent Mass 1. Attach the block to the bottom of the triple beam balance with the light thread as shown in Figure 1. 2. Measure the mass of the block and record in Data Table 1A. 3. Lower the block into the beaker of water so that it is completely below the surface without touching the sides or bottom of the beaker. 4. Measure the apparent mass of the block while it is submerged. This is the apparent mass of the block. Record this value in the Data Table 1A 5. Calculate the upward buoyant "force" exerted on the object by subtracting its mass in water (apparent mass) from its mass in air. 6. In the last column calculate the density of the block using the formula at the top of the table. Measuring the Mass of Displaced Water 7. To find the mass of the water displaced by the block, fill the overflow can to the spout. Set the empty Styrofoam cup below the spout. Holding the thread, slowly lower the block into the overflow can until it is completely submerged. The displaced water will flow from the can into the cup. 8. Measure and record the mass of the displaced water in the Styrofoam cup. Second Denser than Water Sample Repeat the above steps for a second object made of a different material