Physics
High School (11–12)
Mechanics › Elasticity and Mechanical Properties of SolidsMechanics › Pressure and FluidsMechanics › Work, Energy and PowerChapter 8Mechanical Properties of Solids
A steel cable holds a lift, a bridge bends a little under a lorry, and a rubber band snaps back. A solid changes its shape when we push, pull or twist it, and it comes back when we let it go. In this chapter we measure how much a solid changes, with stress and strain, we find the three moduli of elasticity that describe steel, copper or rubber, we find the energy that is stored in a stretched wire, and we use all this to choose the rope of a crane and the beam of a bridge. Python fits the moduli and designs the beams.
Part of Physics · High School (11–12) (chapter 8)
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Stress, Strain and Hooke's Law
Why is a steel wire stretched only a little by a load that makes a rubber band much longer? In this course we define stress and strain, we find the law of Hooke, we read the stress-strain curve of a metal and see what happens when it yields and breaks, and we use Young's modulus to find how much a wire stretches.
Shear Modulus, Bulk Modulus and Poisson's Ratio
A solid can be stretched, but it can also be sheared and squeezed, and a stretched wire also gets thinner. In this course we find the shear modulus and the bulk modulus, we see why a liquid has no shear modulus, we find how much water is compressed in the deep sea, and we use Poisson's ratio to connect the three moduli.