The act of rubbing the surface of one body against that of another; attrition; in hygiene, the act of rubbing the body with the hand, with flannel, or with a brush etc., to excite the skin to healthy action.
The resistance which a body meets with from the surface on which it moves. It may be resistance to sliding motion, or to rolling motion.
A clashing between two persons or parties in opinions or work; a disagreement tending to prevent or retard progress.
Features of war that resist all action, make the simple difficult, and the difficult seemingly impossible. Friction may be mental (such as indecision) or physical (such as enemy fire). Friction may be imposed by enemy action or a variety of other physical and human factors. Fear is a key factor in the appearance of friction in military operations.
Resistance between the contact surfaces of two bodies in motion.
A frontiersman might rub two sticks together and the result is a fire. The rubbing of a coin can result in a wear on its surface. Typically, friction causes various degrees of noticeable wear and results in lowering the desire (and value) of a coin. Friction can be caused by a coin sliding in a holder, coin drawer, or even by a good intending collector who tries to "clean" the coin.
a retarding force that resists motion between systems that are in contact
Mechanical resistance to the relative movement of two surfaces. There are two main types of friction; STATIC FRICTION and DYNAMIC FRICTION. Typically static friction is greater than dynamic friction.
The resistance one body encounters when moving over another. Friction slows things down (e.g. your bike's brakes on your bike wheels) and generates heat in the process.
the resistance a body meets when moving over a surface or through a gas or liquid. Friction always opposes movement; it disappears when movement ceases.
a retarding force between two objects that inhibits motion.
A force acting at the interface between two objects that resists the motion or tendency to motion of one object relative to the other. (See also Coefficient of friction.)
Resistance to sliding on a surface.
force that opposes the motion of an object
The act of rubbing the surface of an object against that of another
The force that tends to stop objects from sliding. Friction is helpful when sneakers keep you from slipping, and harmful when parts rub against each other in a machine.
Resistance created by the surface of one object moving over the surface of another due to the interlocking of minute projections from the surfaces; this is called solid friction. If a lubricant is introduced between the two moving surfaces, fluid friction replaces solid friction.
the rubbing against two objects
The interaction between surfaces: a measure of the resistance felt when sliding one body over another.
The rubbing of one material against another.
Friction is the resistance to motion caused by contact between two bodies. If two bodies are in contact, there is not any friction between them unless an attempt is made to move the bodies relative to one another then a friction force develops between them which tends to impede the motion. The impediment to the motion may have two forms: The motion may be completely prevented because the friction force prevents all motion. The bodies may slide relative to one another, but the friction force acts to oppose the motion, even though the friction force is not terse enough to stop the motion.
A force that opposes motion. Frictional forces convert mechanical motion into heat.
Resistance between two surfaces moving against each other.
Force that resists the motion of a roller coaster train/car.
Friction is a force that resists the motion of an object. Friction results from the close interaction between two surfaces that are sliding across each other. When you slam on your brakes and your car skids to a stop with locked wheels, it is the force of friction that brings it to a stop. Friction resists the car's motion. A g is a unit of acceleration equal to the acceleration caused by gravity. Gravity causes free-falling objects on the Earth to change their speeds at rates of about 10 m/s each second. That would be equivalent to a change in speed of 32 ft/s in each consecutive second. If an object is said to experience 3 g's of acceleration, then the object is changing its speed at a rate of about 30 m/s every second.
mechanical resistant force between two objects.
resistance to motion due to contacting surfaces.
the resistance encountered when one body is moved in contact with another
effort expended in rubbing one object against another
A resistance to motion caused by contact with a surface. Friction can be constant with varying speed (Coulomb friction) or proportional to speed (viscous friction).
1. A resistance force opposing motion. 2. A force that resists motion whenever the surfaces of two objects rub against each other.
rubbing; the force that opposes motion
Resistance to motion of one object over another. Friction depends on the smoothness of the contacting surfaces, as well as the force with which they are pressed together.
Rubbing that causes mechanical trauma to the skin.
A force which makes two contacting objects resist relative movement.
A resistance to mechanical motion caused by two surfaces rubbing against each other. The three types of friction are: 1) Static; 2) Dynamic (constant with varying speed); and 3) Viscous (increases with increased speed).
Friction is a force that acts between objects that are sliding over each other. The direction of the force of friction is always such that it resists the motion. Friction
A force that resists the relative motion of objects that are in contact with each other.
A force that opposes the relative sliding motion between two surfaces in contact with each other.
Resistance to motion between nut and spindle/screw
effect of the resistance exerted by two moving objects in contact with each other. E.g.: the piston in the cylinders. The effects of friction can be limited by fine adjustment and lubricants.
Resistance to motion of two surfaces that touch.
Resistance to motion incurred when two surfaces touch each other.
the force that slows down motion when something rubs against another thing
Without going into a physics lecture, friction basically refers to the rubbing together of two objects when one or both are moving. This contact releases energy in the form of heat, and eventually results in surface deterioration.
the force that resists relative motion between the surface of the pile and the contact with the soil
Surface resistance to relative motion, which slows down movement and causes heat. ( 081)
A force that tries to slow things down when two things rub against each other.
The resistance to motion when different surfaces are in contact.
The force that resists relative motion between two bodies in contact.
Force opposing relative motion of two objects which are in contact. Friction is what causes a lot of heat loss, which lowers efficiency.
the mechanical resistive force of one object on another object's relative movement when in contact with the first object
The reaction force resulting from surface interaction and adhesion during sliding. The friction Coefficient is defined as the friction force divided by the load.
This is a force which opposes motion between two objects in contact.
The force between the tires and the road surface which causes the tire to grip the road.
The force produced as reaction to movement. All fluids produce friction when they are in motion. The higher the fluid viscosity, the higher the friction force for the same flow rate. Friction is produced internally as one layer of fluid moves with respect to another and also at the fluid wall interface.
the force that acts when two surfaces rub against each other
resistance to movement created when two surfaces are in contact. When friction is present, movement between the surfaces produces heat.
Force that resists relative motion between two objects in contact.
A disturbance which appears either on the high-points of a coin or in the fields, as a result of that coin rubbing against other objects. A coin is said to have friction when only the lustre is disturbed, and no actual wear of the metal is visible to the naked eye. Many strictly uncirculated coins can have some friction, often from storage in old style coin cabinets or albums or from rubbing against other coins in rolls. (See "Rubbing").
A term that refers to the rubbing of two moving parts against each other. Friction creates heat and wears down moving parts. This physical property is also used
This is the deepest of the Swedish massage strokes. This stroke encompasses deep, circular movements applied to soft tissue causing the underlying layers of tissue to rub against each other. The result triggers an increase in blood flow to the massaged area.
The resistance caused by one object moving over another.
Friction is defined as the resistance to motion between surfaces in contact. Friction can be constant or it can vary with speed. Elements contributing to overall friction may be in the form of drag, sliding friction, system wear or lubricant viscosity.
A force that impedes the slipping and sliding of two surfaces in contact. A skidding tire is a good example of friction at work.
A force that resists motion between two objects in contact. Friction results in the conversion of mechanical energy into waste heat that dissipates into the surrounding environment.
The energy released upon the bowling ball contacting the lane surface causing the transition from skid to roll.
a force that acts to limit the movement of air
Friction is the resistance found at the duct and piping walls. Resistance creates a static pressure loss in systems. The primary purpose of a fan or pump is to produce a design volume of fluid at a pressure equal to the frictional resistance of the system and the other dynamic pressure losses of the components.
A force that opposes the motion between two objects in contact with each other. The force of friction between two objects is determined as the product of the normal force between the two objects and the coefficient of friction between them.
the resisting force encountered at the common boundary between two bodies when, under the action of an external force, one body, moves or tends to move relative to the surface of the other.
Resistance to relative motion between two bodies in contact caused by the surface characteristics of the bodies at the point or area of contact, and the contact pressure.
the resistance that occurs when two objects rub together.
The rubbing of one surface or thing against another.
The resistance to relative motion between two surfaces in contact
Resistance of motion caused by surface contact.
The frictional force developed at startup, due to the tendency of O-rings to adhere to the microfine grooves of surrounding surfaces.
The frictional force developed during continuous operation of an O-ring.
A resistance to the relative displacement of contacting bodies in a direction tangent to the plane of contact, owing principally to surface roughness and contact pressure.
(Or frictional force.) The mechanical resistive force offered by one medium or body to the relative motion of another medium or body in contact with the first. Solid bodies in relative motion display sliding and rolling friction that depend upon the forces pressing the bodies together, but that are nearly independent of the shapes or relative speeds of the bodies. The resistance of fluids to the relative motion of a solid body is, however, dependent upon the relative speed and the shape of the body, as well as upon the character of the flow itself ( see drag). Turbulent resistance of the earth on the atmosphere ( surface friction) has been represented as proportional to both the first and second power of the speed of the low-level winds. The first representation leads to the cross-isobar frictional wind and to an estimate of the low- level frictional convergence, while the second representation has been employed in studies of momentum and energy abstraction from the atmosphere at the earth's surface. The word "friction" is often inappropriately used in place of turbulent drag when describing the differences between the atmospheric boundary layer and the rest of the troposphere.
The resistance to motion between two bodies under the action of an external force.
Friction developed in dynamic seal situations during machine start-up. When machine operation is irregular, O-rings tend to conform (adhere) to the microfine grooves of surrounding glandular surfaces, requiring extra initial force to break them out of these microfine grooves.
The resistance to motion of a surface as the result of its contact with another surface.
Friction is a physical force that acts against the relative movement of two contiguous bodies. If a body is to be moved while being in contact with another one, work has to be done against the forces resulting from this contact. If a block is pulled upon by a defined force, then the block moves as soon as the force is higher than the adhesional force. If two solid bodies are moved relative to one another, then dynamic friction can be observed. In engineering, such a frictional force can be lowered by lubrication. Another possibility to decrease friction is the modification of the surfaces through deposition of atoms and molecules onto surfaces. The specific subject of friction is called tribology.
1. The rubbing of one object against another. 2. The resistance to motion of two adjoining surfaces, such as between a fluid and the pipe through which it runs.
In meteorology, it is the turbulent resistance of the earth on the atmosphere. Considered as the resistance of fluids ( air and water) to the relative motion of a solid body. The amount is dependent on the size and shape of the body.
Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. It is not, however, a fundamental force, as it originates from the electromagnetic forces and exchange force between atoms. In situations where the surfaces in contact are moving relative to each other, the friction between the two objects converts kinetic energy into thermal energy, or heat (atomic vibrations).