WVC PHYS222 Winter 2019 Lab 2.docx - Elasticity Young’s Modulus Max Stevens Luke Corbin ABSTRACT The purpose of this lab is to explore elasticity by

# WVC PHYS222 Winter 2019 Lab 2.docx - Elasticity Young’s...

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Elasticity: Young’s Modulus Max Stevens Luke Corbin 1/16/2019 ABSTRACT: The purpose of this lab is to explore elasticity by experimentally determining the Young’s modulus of a wire. INTRODUCTION: Part of elasticity is determining how much the object will deform under an amount of force before returning back to its original shape when the force is removed. For example, determining how far a rubber band stretches under a certain amount of applied force. This is determined by a value that represents the ratio of stress to strain, called a modulus. The modulus is constant for a material. There are three types of moduli, Young’s modulus, shear modulus, and bulk modulus. This lab considers Young’s modulus, which deals with tensile stress or the amount an object “stretches” when it is under tension. Young’s modulus is usually used with cables, wires, ropes, or other long, slender objects that hold tension. Stress would be the force of the tension per the cross sectional area of the wire, strain would be the percent change in the length of the wire, or the quotient of the change in length and the total length of the wire. All of these variables are measured in this lab and the Young’s modulus of a wire is determined.

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THEORY: The main formula used is Young’s modulus. Both tensile stress and tensile strain are used separately to fill parts of our data table. After which these are used in combination to find Young’s modulus for our wire. Y tensile stress tensile strain = F / A Δ L / L i In order to find how far the wire has stretched the the rotation of cylinder with radius R that the wire is wrapped around must be considered. This is directly proportional and is calculated using the following formula. Δ L = Using the reflection in a mirror mounted on the cylinder, θ as shown above is found using this formula. Δ y is the change from initial height viewed through the telescope to height after weight is added and D is the distance from the telescope to the mirror tan
• Fall '18
• Bruce Unger
• Force, elastic modulus

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