Young’s modulus

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Young’s modulus

  1. 1. Young’sModulus
  2. 2. Define the following• Strain• Stress• Brittle• Elastic
  3. 3. Define the following• Stress – The force applied per cross-sectional area of a material• Strain – The extension in length resulting from stress• Brittle – A material that breaks without plastic deformation• Elastic – A material that returns to its original shape after deformation
  4. 4. Define the following Key Word Definition ExampleStiff Does not easily change shape when force is applied GlassElastic Returns to original shape when force is removed. CopperPlastic Remains deformed when force is removed Blu-tacDuctile Can be readily pulled out into a thinner shape. CopperMalleable Can be deformed under compression CopperStrong Requires a large force to break it SteelBrittle Easily cracks GlassTough Needs a large force to deform it KevlarSmooth Low friction surface PTFE Properties do not deteriorate with repeated loadingDurable Bone and unloading
  5. 5. Stress vs Strain
  6. 6. Things we will need to measure to start
  7. 7. The TableMass (kg) Weight (N) Area (m2) Stress Length (m) Extension Strain (N/m2) (m)
  8. 8. Working out uncertainty
  9. 9. Working out uncertainty 2• Whether you are multiplying or dividing units, you will always add the uncertainties together.• I measure the side of a cube to be 10±0.5cm• What is its volume if all dimensions are the same?• What is the uncertainty with that volume?

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