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List the various types of friction. Calculate the magnitude of static and kinetic friction, and use these in problems involving Newton’s laws of motion. When a body is in motion, it has resistance because the body interacts with its surroundings. This resistance is a force of friction.
- 6.5: Friction (Part 2)
When an object is not on a horizontal surface, as with the...
- 6.5: Friction (Part 2)
17 Φεβ 2023 · Find out the meaning of friction in physics. Learn its types, laws, & equations, along with a few examples and diagrams. What are its advantages & disadvantages.
The magnitude of the frictional force has two forms: one for static situations (static friction), the other for situations involving motion (kinetic friction). What follows is an approximate empirical (experimentally determined) model only. These equations for static and kinetic friction are not vector equations.
The equations given earlier include the dependence of friction on materials and the normal force. The direction of friction is always opposite that of motion, parallel to the surface between objects, and perpendicular to the normal force.
Friction is a force between solid surfaces in contact. Friction is tangential to the surface and points opposite the direction of motion (or intended motion).
Part of the friction is due to adhesive forces between the surface molecules of the two objects, which explain the dependence of friction on the nature of the substances. Adhesion varies with substances in contact and is a complicated aspect of surface physics.
When an object is not on a horizontal surface, as with the inclined plane, we must find the force acting on the object that is directed perpendicular to the surface; it is a component of the weight. We now derive a useful relationship for calculating coefficient of friction on an inclined plane.
