Dynamics II - Rolling and Fluid Friction

Vocabulary flashcards covering rolling friction, methods to reduce friction, fluid characteristics, and drag force from Dynamics II.

Rolling friction

The opposing force of friction experienced when a body (such as a heavy spherical ball, ring, or cylinder) rolls over a surface.

Rolling friction magnitude

For an object of the same weight, the force that is much smaller than static or sliding friction, even by $2$ or $3$ orders of magnitude.

Methods to reduce friction

Techniques used to decrease frictional resistance between contacting surfaces, specifically polishing, using ball bearings, and applying lubricants.

Fluid

A collection of molecules held together by weak cohesive forces and the forces exerted by the walls of a container, encompassing both liquids and gases that can flow and exert force on container walls.

Drag force

The retarding force experienced by an object moving through a fluid that tends to reduce the speed of the object, resulting from fluid friction.