Archimedes' Principle

Archimedes' Principle - Archimedes Principle October 4,...

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Archimedes Principle October 4, 2008 Sloane Schneider Lab Partners: Taylor Whipple, Cory Wilkinson, Amy Kalal Objectives:
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In this experiment Newton’s 2 nd Law can be applied to yield B = T – T’ and Archimedes Principle can be used as B = ρw gV . Both Newton’s 2 nd Law equation and Archimedes Principle can be used to solve for the density of unknown objects or fluids. Theory: To accurately measure the weight of an object one must take into account not only the objects mass, but also the force that gravity exerts upon the object. To begin this experiment an object is hung from a scale in the air that allows the true weight of the object to be calculated. This can be seen by applying Newton’s 2 nd Law when T – mg = 0 , where T is the scale reading, m is the mass of the object, and g is the acceleration due to gravity. Since the object is motionless, the acceleration is zero and the tension must equal the weight. In order to accurately measure the density of the same object it must be entirely submersed in fluid. The fluid exerts an upward force on the object, this upward force is labeled B because it is a buoyant force. In applying Newton’s 2 nd Law again the equation T’ + B – mg =0 is given where T’ is the new scale reading. To solve for the buoyant force exerted on the object the two Newton’s Law equations can be equated, giving: = - B T T' There are other ways to determine the buoyant force exerted on an object, one such method is known as Archimedes Principle. This principle states that the buoyant force is equal to the weight of the fluid displaced. When weight is calculated in terms of density ( ρw ) the following equation can be used = B ρwgV where g is the force due to gravity and V is the volume of the submerged object. When both equations for buoyant force are set equal to each other a new equation can be found,
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This note was uploaded on 11/25/2008 for the course PHYS 2210 taught by Professor Sowell during the Spring '08 term at UNO.

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Archimedes' Principle - Archimedes Principle October 4,...

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