## Froude Number

The Froude Number is a dimensionless number used to describe the resistance of objects while moving through water. This provides a method for comparing multiple objects that are of differing sizes and have different underwater forms.

#### Origin

Developed by William Froude in 19th century as a method for reliably predicting the resistance of water on floating objects.

#### Equation

For a ship the Froude Number is as follows:

*Where:*

- V = Velocity of ship
- g = acceleration due to gravity
- L = Length of ship on the waterline