Difference between revisions of "Static friction"

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Revision as of 15:17, 22 November 2009

Definition

Intensional definition

Static friction is defined as the form of friction between two bodies, exerted via their surface of contact tangential to the surface of contact, when the surfaces of contact are not slipping against each other.

Note that this form of friction is acting not only when the two bodies are at rest with respect to each other, but also in the case of rolling -- when the bodies are moving relative to each other but there is no slipping at the region of contact.

Tendency-based definition

Static friction is defined as the form of friction between two bodies that opposes the tendency for the surfaces of contact to slip relative to each other. In magnitude, it is equal to the net external force between the two bodies tangential to the surface of contact, and in direction it is opposite to that net external force.

Related forces

  • Kinetic friction or dynamic friction is the friction between two bodies that occurs via surfaces of contact that are slipping against each other.