Physics 141 Archimedes --1
ARCHIMEDES’ PRINCIPLE AND SPECIFIC DENSITY
GOAL: To investigate buoyant force and Archimedes’ principle. To measure the specific density of several materials. INTRODUCTION: Try pushing down on a basketball in water and you feel the buoyant force that makes the ball float. As more of the ball is pushed beneath the water, the upward force becomes greater. One could make a first guess (Hypothesis #1) that the buoyant force increases with the submerged volume of the object. A more mathematical guess (Hypothesis #2) might be that the upward or buoyant force, B, is proportional to the submerged volume, Vsub, of the object. feathers, is in fact a statement that the density of lead is greater than the density of
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METHOD I. (Spring Scale Method) Using the spring scale, measure the buoyant force as a function of volume submerged for the wooden block (use eq.6). This is a test of Hypotheses # 1 and 2. To measure the submerged volume, consider placing a piece of tape marked with distances along the height of the block. Compare this volume to the increase in volume in the container as indicated by the rise in the water level (Hypothesis #3). Estimate the specific density of the wooden block. Consider using the weights from the mass set to extend this measurement into the experimental region where the buoyant force exceeds the weight of the block.
Figure 2 The pan balance method for measuring the buoyant force and specific density. METHOD III. (Graduated Cylinder Method) Determine the mass of the empty graduated cylinder and an average mass for the washers. Place about 10 washers in the graduated cylinder, and carefully place the cylinder in the beaker which is about 2/3 full of water. This initial loading with washers should insure that the cylinder floats upright, if not add more washers. Be careful not to have air bubbles under the base of the cylinder. Record the number of washers and volume markings on the graduated cylinder at the waterline as the cylinder floats. Add a washer, and record these values again. Repeat this process of adding washer and recording up to the point of sinking the cylinder. Plot volume marking vs number of washers
METHOD II. (Pan
3. Analyze: What do you notice about the density of the Styrofoam pieces? The density remains the same.
because each of the objects displaced the water by 1 mL, their mass over that mL is their density.
Density is the amount of matter per unit of measurement (Merriam-Webster. Merriam-Webster, n.d. Web. 26 Aug. 2016.). If water has a density of 1.0 g/mL and you place a substance with a density of 1.8 g/mL the substance will sink because it is denser than water. Density is often measured in g/cm^3 or g/mL because the formula for density is D=m/v.
Purpose: Weighing objects. Figuring out the density with an object by calculated volume and Archimedes’ Principle.
First, I will get my materials and set up the scale and 10 mL cylinder and refraction cell. I will check the size of the graduated cylinder to find out the volume. (LxHxW) That will equal 40.5mL for volume. I will see how much the cell weighs alone, and then I will 0 out the scale to see how much the water weighs. Then I will see how much the water and the cell weigh together. I will do this for the cell and cylinder. I will check to see if the density I calculated is what it is supposed to be at 1.00.
I took the graduated cylinder and started filling it up with water until the bottom of the meniscus was to the the 100.0 mL mark with the assistance of a dropper pipet. I then took the 13 x 100 mm test tube and slowly poured the water from the graduated cylinder into the test tube until it was full to the top. I then poured the water in the test tube out into the sink and put the graduated cylinder on the counter so I can get an accurate measurement of the lower meniscus to record on my data table. I once again followed the same procedure again filling a second test tube with water from the graduated cylinder then setting it on a straight surface to get an accurate measure of the volume to
11. Tare the scale by pressing the Φ/T button so that the scale reads 0.0 g.
1. Move the lid of the container up or down. Record the resulting volume and pressure
Introduction: Accuracy and precision were the major aspects of the lab. Accuracy is how close the average of the measured values are to the actual value. Precision is the closeness of repeated measurements. In the lab, the aim was to get as close as possible with both accuracy and precision when determining the mass and volume of the spheres. The mass was determined by weighing the spheres on the Analytical Scale and Triple Beam Balance Scale. The volume is determined by measuring with a ruler and by water displacement. The standard
In Measuring and Understanding Density, several experiments were performed to find density of regularly shaped objects, irregularly shaped objects, liquids and gasses. An additional experiment was done to find the specific gravity of a sampling of liquids. The purpose of the experiment was to provide a better understanding of density and to be able to extrapolate unknowns based upon these calculations. The experiments yielded data in keeping with Kinetic-molecular theory in regards to the density of water versus its temperature. Key measurements and formulae were also used to determine densities of metal and plastic objects as well as irregularly shaped rocks. It is possible to find the density of an object (be it liquid, gas or
the Archimedes’ principle method? Why? The water displacement method is more accurate. The string used to suspend the object in the Archimedes’ Method could
1) Cubic B and C experiences the greatest buoyancy. Buoyancy = density of fluid x gravitational acceleration x volume of fluid displaced by an object. The fluid density and gravitational acceleration is the same and since cubic B and C has the largest volume of fluid displaced, it resulted in the largest buoyancy.
A volumetric pipette & measuring cylinder can be calibrated by just weighing the water they deliver. As for volumetric flask, the weight of an empty flask is recorded. Next, weigh the flask after filling it with water to the mark.
Archimedes is one the most famous and ancient scientists who helped shape the world as it is today. He was born in 287 B.C. in Syracuse. While growing up, Archimedes became interested in problem solving and later went to study at the Royal Library of Alexandria. He invented the screw, pi, and founded the principle of Archimedes. Many of the things and accomplishments of Archimedes helped people in the past and continue to be the basis of many modern technological things today.
1) Derive equations for the mass (Mtheoretical) that balances the hydrostatic force for the partially submerged case. (i.e. h less than a) Mtheoretical = f(a, b, g, k, h, L, γw)