Define the following• Strain• Stress• Brittle• Elastic
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
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
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?