lecture24_09 - Phy 2053 Announcements Good luck on Exam 2!...

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1 Phy 2053 Announcements ± Good luck on Exam 2! ± Exam 2 grades – grades should be available by Monday, April 6 on UF e- Learning web site. ± Exam 2 solutions will be posted early next week ± HW Assignment 9 next Wednesday, April 8 ± Stress - force per unit area causing the deformation ± Strain - measure of the amount of deformation ± The elastic modulus is the constant of proportionality between stress and strain ± Three types of moduli: ± Young’s modulus, shear modulus, bulk modulus Elastic Properties of Solids o FL Y AL Δ = Young’s Modulus: Y Strain Stress = Stress = Y x Strain or Stress ( F/A ) has units of N/m 2 1 N/m 2 = 1 Pascal (Pa) Young’s Modulus: Elasticity in Length, Hooke’s Law redux F A L 0 Δ L Stress = F/A Strain = Δ L/L 0 L L Y A F L L Y A F Δ = Δ = 0 0 k Determine the elongation of the rod shown below if it is under a tension of 5.8 × 10 3 N. Example #9-11 Y Al = 7 x 10 10 Pa 11 x 10 10 Pa Shear Modulus ± ± S is the shear modulus ± A material having a large shear modulus is difficult to bend F
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lecture24_09 - Phy 2053 Announcements Good luck on Exam 2!...

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