# Elasticity

## References

### Definitions

Strain: A fractional change in length or deformation of a material body under the action of applied forces.
Stress: Force per unit area.  A force exerted when one body or body part presses on, pulls on, pushes against, or tends to compress or twist another body or body part.
Modulus: The ratio of the stress in a body to the corresponding strain.
Young's Modulus: Measures the resistance of a solid to a change in its length.
Shear Modulus: Measures the resistance to motion of the planes of a solid sliding past each other.
Bulk Modulus: Measures the resistance that solids or liquids offer to the changes in their volume.

### Equations

 Elastic Moduli stress = modulus X strain Tension and Compression F/A = E (L/L) E is Young's Modulus Shearing Stress F/A = G (x/L) G is the shear modulus Hydraulic Stress p = B (V/V) B is the bulk modulus

# Mechanics List of Topics

 Measurements Newton's Laws Potential Energy and Conservation of Energy Rotation of Rigid Bodies Elasticity Vectors Forces and Fields Linear Momentum Angular Momentum Mechanical Oscillations Motion of Point-Mass Objects in One Dimension The Gravitational Field Collisions Torque Mechanical Waves Motion of Point-Mass Objects in Two and Three Dimensions Kinetic Energy and Work Circular Motion of Point-Mass Objects Equilibrium Sound

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