Definitions for

**"Coefficient of friction"****Related Terms:**Friction, Kinetic friction, Static friction, Normal force, Drag coefficient, G-force, Load, Force, Moment of inertia, Torque, Shear force, Gravitational constant, Stiction, Coefficient of drag, Moment, Momentum, Lift, Thrust , Terminal velocity, Centripetal force, Inertia , Centrifugal force, Newton's second law of motion, Weight, Shear, Lateral acceleration, Rolling resistance, Axial force, Ballistic coefficient, Air resistance, Gravity, G force, Gravitation, Conservation of momentum, Linear momentum, Radial load, Conservation of angular momentum, Newton's laws of motion, Centripetal acceleration, Surface roughness, Radius of gyration, Drift , Aerodynamic drag, Lift coefficient, Angular momentum, Spring , Cof, Statics, Newton's first law of motion

A constant varying with the speed, length of surface and condition of surface. This is usually determined experimentally and applied as if it was constant over the full length of the hull. It isn't, of course, but the difference is slight.

In plastics films, indicates the ease with which a film surface is slid against like film or adjacent surface. A low value (near zero) indicates a slippery; a high value (7 or more) indicates a tacky film, which will stick to itself.

A dimensionless number representing the ratio of the friction force to normal force. Typically for threaded connections it is between 0.10 to 0,18 but can vary significantly depending upon the materials used and whether a lubricant has been used.

Measurement, either dynamic or static, used to determine different aspects of slippage on a tiled plane. Measures include wet and dry conditions, speed of subject, required force to move subject, and critical angle of tiled surface. Area use and maintenance directly affect a tile's coefficient of friction.

A measure of a bowling ball's ability to grip the lane surface. Where there is no friction there can be no traction, and consequently, no hook.

the ratio of the force of friction to the normal force pressing the surfaces together (see table 4.2)

The ratio of the friction force between two objects and the force pressing the objects together. "Static coefficient of friction" is the ratio of the hoizontal force needed to initiate a slipping action of an object along a surface, and the vertical force on the surface. "Dynamic coefficient of friction" is the ratio of the horizontal force needed to continue a slipping action of an object along a surface, and the vertical force on the surface. A higher coefficient indicates greater surface traction.

a numerical expression of the ratio between the force of contact existing between two surfaces and the resistant force tending to oppose the motion of one with respect to the other. The coefficient of friction is used in determining the power necessary to drive a machine; to determine the slope angles used in hoppers, bins, chutes, and bunkers; or to determine the maximum angle of inclination for a conveyor.

the ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface

a number that tells how much of a the clamping force between two objects will be converted to friction to resist sliding

The ratio of the static or kinetic friction force to the normal force.

Number obtained by dividing the friction force resisting motion between two bodies by the normal force pressing the bodies together.

The ratio of the force required to move a package across a belt surface to the weight of the package.

(see Slide Resistance)

Resistance to sliding or rolling of surfaces of solid bodies in contact with each other; stated as k=F/W in which F is the force required to move one surface over another and W is the weight pressing the surfaces together.

Measures how easily one surface slides over another Consider the simple situation in the diagram, where a block is about to slide on an inclined surface. (If the surface is inclined slightly more, the block will slide downwards.) F is the force parallel to the inclined surface, which is almost enough to make the block slide downwards. P is the force with which the block presses against the inclined surface. Coefficient of static friction between the block and the inclined surface = F / P and has no dimensions (no units). For slippery surfaces, the coefficient of friction is low.

Dimensionless ratio of the friction force (F) between two bodies to the normal force (LN) pressing the bodies together.

The amount of friction there is between two items that is dependent on the composition of the two materials.

The ratio of the force that is necessary to move an object and the weight of the object. It is a measure of the amount of friction that exists between two materials as one slides over the other. The coefficient of friction is zero if there is no friction, and it is infinite if no motion is possible. For more information see How Brakes Work: Friction (How Stuff Works, USA).

(r) the force in the direction of motion required to move one surface with respect to another, divided by the force normal to the two surfaces.

(COF) the ratio of tangential force to normal load during a sliding process; dry rubbers have high coefficients of friction unless specially formulated, but any lubrication of rubber by water, soapy water, or light oil will drop the apparent COF very quickly

The ratio of force necessary to move an object compared to the weight of the object itself.

Gripping ability important for rope use on winches and in situations where slipperiness can be dangerous or cause problems. Gripping depends upon the friction or texture of the rope itself, its elasticity, creep (or taffy effect, as in monofilament polypro), the area of contact, and the ratio of rope size to bitt size.

A comparative value indicating the ability of the film surface to move against itself or another surface. The higher the coefficient of friction, the more difficult to slip or move.

static: the ration of the limiting friction developed to the corresponding normal pressure, if two surfaces move relative to each other.

The measure of the relative difficulty with which the surface of one material will slide over an adjacent surface or another material.

The coefficient of friction (also called COF, or friction) is a measurement of the force it takes to slide an object across another surface divided by the object's weight. In bowling, the coefficient of friction refers to how well the bowling ball grabs the lane surface. If lane oil is present the ball slides on the lane surface very easily and there is a low COF. If there is no oil on the lane, the ball does not slide as easily and the coefficient of friction is high. A more aggressive shell material has an even higher coefficient of friction. The greater the coefficient of friction, the sooner the ball will grab the lane and hook.

The quotient obtained by dividing the value of the force necessary to move one body over another at a constant speed by the weight of the body. For example, if a force of 20 Newtons is needed to move a body weighing 100 Newtons over another horizontal body at a constant speed, the coefficient of friction between these two materials is 20/100 or 0.2.

The measure of the resistance of one surface moving against another.

A quantity representing the extent to which friction develops between two objects in contact as the normal force changes.

See 'Friction Coefficient'

A number expressing the amount of resistance to relative motion between two bodies in contact and dependent upon the physical characteristics of the contact surfaces of those bodies.

The dimensionless numerical representation of the ease with which two objects or surfaces will slide against each other. Low numbers slide easily. Total range due to the test definition is 0 to 1.

The ratio between the tangential force (T) required to cause a body to slide along a plane and the normal force (N) between the body and the plane: mN. Along a wall or foundation surface: = tan where = angle of wall friction

Dimensionless value for friction from the ratio of the frictional force to the normal force.

Friction is the force that resists the sliding motion of two surfaces in contact. The force of friction may be present whenever two objects are in contact. It is easily observed when one attempts to move a heavy piece of furniture along the floor.

Slip resistance of a tile.