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Three kinds of friction: • Static friction: acts to prevent motion, so points opposite to the direction the object would move in the absence of friction • Kinetic friction: appears when an object slides across a surface; points opposite to the direction of motion • Rolling friction: one surface rolling over another KJF §4.3, 5.5 3
Friction is a force that resists the movement of two contacting surfaces that slide relative to one another. This force acts tangent to the surface at the points of contact and is directed so as to oppose the possible or existing motion between the surfaces.
Friction is the resisting force encountered when one surface slides over another; this force acts along the tangent to the surfaces in contact. The force necessary to overcome friction depends on the nature of the materials in contact, their roughness or smoothness, and the normal force, but not on the area of contact.
friction refers to cases in which one surface moves relative to the other one, such as when a box slides across the floor, while static friction refers to cases in which the surfaces do not move relative to each other, such as when a person is pushing on a stationary heavy
1) Frictional forces depend on the two materials that are sliding past each other. A box sliding over a waxed floor experiences less friction than a box sliding over an unwaxed floor. 2) There are two types of friction for most surfaces: static friction and kinetic (or sliding) friction.
The Force of Friction (F K or F S) The force of friction is also associated with objects being in contact with one another, being the component of the contact force that is parallel to the surface of contact. The force of kinetic friction, F K , applies to situations where one object is sliding over another, while the force of static friction, F
• Sliding frictional force: when surfaces are sliding • Static frictional forces always greater than sliding ones • Lubrication provides microscopic rollers between surfaces
