-dry friction, coefficient of friction

Fluid friction occurs between layers of fluid that are in motion

Dry friction is the resistance created by the contact forces that develop when between two unlubricated or dry surfaces

A frictional force occurs when two surfaces in contact attempt to move across one another.
The force is determined by:
• the nature of the two contacting surfaces
• whether the surfaces are in motion or stationary contact
• the magnitude of the force pushing them together (normal force)

Static friction –

Kinetic friction –

Coefficients of friction:

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