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Acta Polytechnica Hungarica , 12 4 , In: Acta Polytechnica Hungarica , Vol. Takarics B, Baranyi P. Acta Polytechnica Hungarica.
Why the coefficient of static friction is greater thant the coefficient of kinetic friction? What form of energy is produced when the wheels of a car move?
What needs to happen for a volcano to form? Why does Friction turn into Thermal energy? What are the problem caused by friction?
What is the factor that slows a pendulum down and eventually causes it to stop? Does the coefficient of sliding friction depend on the kinds of materials in contact?
PDH Online, Meadow Estates Drive Fairfax, VA The Engineering Toolbox. Retrieved 25 November Categories : Friction Fluid dynamics Fluid mechanics Mechanical engineering Piping.
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Laws of Friction Laws of Friction State laws of friction The five laws of friction Friction force depends on the normal reaction R.
Friction force is direct proportional and perpendicular to the normal reaction. Friction is independent of the area of contact. The coefficient of static friction is slightly greater than the coefficient of kinetic friction.
Kinetic friction is independent of velocity of the body. Friction depends on the nature of the surfaces in contact. Rough surfaces exert much friction compared to smooth surfaces.
The Coefficient of Friction Determine the coefficient of friction Coefficient of friction is the ratio of the frictional force that acts between two objects in contact to the normal reaction, R.
Types of Coefficient of friction Coefficient of friction can be static or dynamic. This is obtained when the body is trying to start a motion but not yet moving.
This is obtained when the body is in motion. Coefficient of dynamic friction is slightly smaller than the coefficient of static friction.
Example 2 Find the static friction between a block of wood of mass 10kg and the table on which it rests. A minimum force of 50N is required to make the block just move on the table top.
Example 3 A mass is placed on an Inclined plane such that it moves at a constant speed when tapped tightly.
Find the coefficient of dynamic friction. Emoticon Emoticon. Home Physics PHYSICS: FORM THREE: Topic 2 - FRICTION. Tags Physics. TOPIC 2: FRICTION Concept of Friction.
The Concept of Friction. Explain the concept for friction. Friction is the force which opposes resists motion of the body.
The peak and valleys on the surfaces of bodies may be due to a random arrangement of coarse particles, for example the surface of a grinding stones.
A practically important case is the self-oscillation of the strings of bowed instruments such as the violin , cello , hurdy-gurdy , erhu , etc.
A connection between dry friction and flutter instability in a simple mechanical system has been discovered,  watch the movie for more details.
Frictional instabilities can lead to the formation of new self-organized patterns or "secondary structures" at the sliding interface, such as in-situ formed tribofilms which are utilized for the reduction of friction and wear in so-called self-lubricating materials.
Fluid friction occurs between fluid layers that are moving relative to each other. This internal resistance to flow is named viscosity.
In everyday terms, the viscosity of a fluid is described as its "thickness". Thus, water is "thin", having a lower viscosity, while honey is "thick", having a higher viscosity.
The less viscous the fluid, the greater its ease of deformation or movement. All real fluids except superfluids offer some resistance to shearing and therefore are viscous.
For teaching and explanatory purposes it is helpful to use the concept of an inviscid fluid or an ideal fluid which offers no resistance to shearing and so is not viscous.
Lubricated friction is a case of fluid friction where a fluid separates two solid surfaces. Lubrication is a technique employed to reduce wear of one or both surfaces in close proximity moving relative to each another by interposing a substance called a lubricant between the surfaces.
In most cases the applied load is carried by pressure generated within the fluid due to the frictional viscous resistance to motion of the lubricating fluid between the surfaces.
Adequate lubrication allows smooth continuous operation of equipment, with only mild wear, and without excessive stresses or seizures at bearings.
When lubrication breaks down, metal or other components can rub destructively over each other, causing heat and possibly damage or failure.
Skin friction arises from the interaction between the fluid and the skin of the body, and is directly related to the area of the surface of the body that is in contact with the fluid.
Skin friction follows the drag equation and rises with the square of the velocity. Skin friction is caused by viscous drag in the boundary layer around the object.
There are two ways to decrease skin friction: the first is to shape the moving body so that smooth flow is possible, like an airfoil.
The second method is to decrease the length and cross-section of the moving object as much as is practicable. Internal friction is the force resisting motion between the elements making up a solid material while it undergoes deformation.
Plastic deformation in solids is an irreversible change in the internal molecular structure of an object. This change may be due to either or both an applied force or a change in temperature.
The change of an object's shape is called strain. The force causing it is called stress. Elastic deformation in solids is reversible change in the internal molecular structure of an object.
Stress does not necessarily cause permanent change. As deformation occurs, internal forces oppose the applied force. If the applied stress is not too large these opposing forces may completely resist the applied force, allowing the object to assume a new equilibrium state and to return to its original shape when the force is removed.
This is known as elastic deformation or elasticity. As a consequence of light pressure, Einstein  in predicted the existence of "radiation friction" which would oppose the movement of matter.
The forces of pressure exerted on the two sides are equal if the plate is at rest. However, if it is in motion, more radiation will be reflected on the surface that is ahead during the motion front surface than on the back surface.
The backwardacting force of pressure exerted on the front surface is thus larger than the force of pressure acting on the back. Hence, as the resultant of the two forces, there remains a force that counteracts the motion of the plate and that increases with the velocity of the plate.
We will call this resultant 'radiation friction' in brief. Rolling resistance is the force that resists the rolling of a wheel or other circular object along a surface caused by deformations in the object or surface.
Generally the force of rolling resistance is less than that associated with kinetic friction. Any wheel equipped with a brake is capable of generating a large retarding force, usually for the purpose of slowing and stopping a vehicle or piece of rotating machinery.
Braking friction differs from rolling friction because the coefficient of friction for rolling friction is small whereas the coefficient of friction for braking friction is designed to be large by choice of materials for brake pads.
Rubbing dissimilar materials against one another can cause a build-up of electrostatic charge , which can be hazardous if flammable gases or vapours are present.
When the static build-up discharges, explosions can be caused by ignition of the flammable mixture.
Belt friction is a physical property observed from the forces acting on a belt wrapped around a pulley, when one end is being pulled.
The resulting tension, which acts on both ends of the belt, can be modeled by the belt friction equation. In practice, the theoretical tension acting on the belt or rope calculated by the belt friction equation can be compared to the maximum tension the belt can support.
This helps a designer of such a rig to know how many times the belt or rope must be wrapped around the pulley to prevent it from slipping.
Mountain climbers and sailing crews demonstrate a standard knowledge of belt friction when accomplishing basic tasks.
Devices such as wheels, ball bearings , roller bearings , and air cushion or other types of fluid bearings can change sliding friction into a much smaller type of rolling friction.
Many thermoplastic materials such as nylon , HDPE and PTFE are commonly used in low friction bearings. They are especially useful because the coefficient of friction falls with increasing imposed load.
A common way to reduce friction is by using a lubricant , such as oil, water, or grease, which is placed between the two surfaces, often dramatically lessening the coefficient of friction.
The science of friction and lubrication is called tribology. Lubricant technology is when lubricants are mixed with the application of science, especially to industrial or commercial objectives.
Superlubricity, a recently discovered effect, has been observed in graphite : it is the substantial decrease of friction between two sliding objects, approaching zero levels.
A very small amount of frictional energy would still be dissipated. Lubricants to overcome friction need not always be thin, turbulent fluids or powdery solids such as graphite and talc ; acoustic lubrication actually uses sound as a lubricant.
Another way to reduce friction between two parts is to superimpose micro-scale vibration to one of the parts.
This can be sinusoidal vibration as used in ultrasound-assisted cutting or vibration noise, known as dither. According to the law of conservation of energy , no energy is destroyed due to friction, though it may be lost to the system of concern.
Energy is transformed from other forms into thermal energy. A sliding hockey puck comes to rest because friction converts its kinetic energy into heat which raises the thermal energy of the puck and the ice surface.
Since heat quickly dissipates, many early philosophers, including Aristotle , wrongly concluded that moving objects lose energy without a driving force.
When an object is pushed along a surface along a path C, the energy converted to heat is given by a line integral , in accordance with the definition of work.
Energy lost to a system as a result of friction is a classic example of thermodynamic irreversibility. In the reference frame of the interface between two surfaces, static friction does no work , because there is never displacement between the surfaces.