Lrn Fzx: Friction Terms

Here are the friction terms we should use with explanations below.

Types of Friction:

Surface Friction - a force parallel to the surfaces in contact that resists sliding

Sliding Surface Friction (Kinetic Surface Friction) - Surface friction for two surfaces moving - sliding - past each other.
Static Surface Friction - Surface friction for two surfaces at rest with respect to each other - no sliding.

Rolling Friction - A resistive force on a rolling object because of tire deformation.
Fluid Friction - A resistive force on an object moving through a liquid or a gas.

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Sliding Surface Friction

Surfaces sliding past each other

Rear wheels sliding

Static Surface Friction -

As long as the tires don't slide

a car stays in static friction in normal travel

even though it's moving.

Static - no sliding

Both types of surface friction are dependent upon the NORMAL FORCE between the surfaces and the SURFACES in contact. Here is the equation - it is a good approximation of reality for smooth and dry and solid surfaces.