9.4 Elasticity of Solids | General Physics

Chad provides a physics lesson on the Elasticity of Solids (aka the Deformation of Solids). The lesson begins with a brief review of Hooke's law for springs as it shows a similarity to the three deformation equations presented in this lesson. But instead of relating force to displacement as for a spring, the deformation equations will relate stress to strain, and instead of a spring constant, the proportionality constant is called an elastic modulus.

The first equation presented regarding the deformation of solids is for stretching and compression which involves Young's modulus. When a load is place on rope or wire, it stretches, and when a load is placed upon a column as in the construction of a building, it compresses. Young's modulus is the proportionality constant in the equation that allows us to calculate the degree of stretching and compression.

The second equation presented regarding the deformation of solids is for the shearing of solid which involves the Shear modulus. When a force is placed upon a solid parallel to one of its faces a shearing deformation is possible. The Shear modulus is the proportionality constant in the equation that allows us to calculate the degree of shearing.

The third equation presented regarding the deformation of solids is for volume deformation which involves the Bulk modulus. When a solid experiences an increase in the surrounding pressure, it is compressed. Likewise, if a solid experiences a decrease in the surrounding pressure, it expands. The Bulk modulus is the proportionality constant in the equation that allows us to calculate the degree of compression or expansion that occurs.

00:00 Lesson Introduction
00:50 Review of Hooke's Law for Springs
02:00 Stretching / Compression and Young's Modulus
08:46 Shear Deformation and the Shear Modulus
15:59 Volume Deformation and the Bulk Modulus

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