# Materials Flashcards

Laminar Flow

- Streamline

- layers do not mix

Turbulent Flow

- Not streamline

- Mixing of layers

Stoke’s Law

viscous drag = 6(pi)(viscocity)rv

Stoke’s Law only works if

- Low speed
- Small
- Spherical
- Terminal Velocity
- Through a fluid

Density =

mass / volume

Upthrust

Weight of fluid displace (DensityxVolumexGravity)

Hooke’s Law

Stretching Force = Spring Constant x extension

What is Hooke’s Law

Stretching Force is directly proportional to extension

Spring Constant

Stiffness

Elastic Limit

Where material will not return to its original size

Gradient of a force extension graph

spring constant

Hooke’s Law also applies to

Compression

Area under force extension graph

Elastic potential energy

Stress

A measure of strength (Force/Cross sectional area)

Strain

A fraction of extension to original length (extension/original length)