Friction - Revision history

Admin at 04:12, 16 December 2022

2022-12-16T04:12:33Z

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	== References ==		== References ==

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	[[Category:Mechanical engineering]]		[[Category:Mechanical engineering]]
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	[[Category:Organic Articles English]]		[[Category:Organic Articles English]]
	[[Category:~~Vigyan Ready~~]]		[[Category:Pages with broken file links]]

Indicwiki: 19 revisions imported from :alpha:Friction

2022-12-16T04:11:31Z

19 revisions imported from alpha:Friction

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alpha>Ramamurthy S: Category added

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	== References ==		== References ==
	[[Category:Mechanical engineering]]		[[Category:Mechanical engineering]]
			<references />
			[[Category:Organic Articles English]]
			[[Category:Vigyan Ready]]

alpha>Ramamurthy S: Content Modified.

2022-12-14T07:29:48Z

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	== Terminology ==		== Terminology ==
	[[File:Friction.jpg\|alt=Solid body on horizontal surface\|thumb\|Fig 1 Solid body on horizontal surface]]		[[File:Friction.jpg\|alt=Solid body on horizontal surface\|thumb\|Fig 1 Solid body on horizontal surface]]

			=== Limiting force of friction ===
	Consider a solid body placed on a horizontal plane surface.		Consider a solid body placed on a horizontal plane surface.

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	P = Force acting on the body through centre of gravity parallel to the horizontal surface		P = Force acting on the body through centre of gravity parallel to the horizontal surface

	if the force P is small , the body will not move as the force of friction F acting on the body in the opposite direction of force P will be more than P. But if the force P is increased at some point when the solid body is on the point of motion.		if the force P is small , the body will not move as the force of friction F acting on the body in the opposite direction of force P will be more than P. But if the force P is increased at some point when the solid body is on the point of motion. At that point force of friction F acting on the body is called ''limiting force of friction''. Limiting force of friction is denoted by F.

	~~=== Limiting force of friction ===~~
	At that point force of friction F acting on the body is called ''limiting force of friction''. Limiting force of friction is denoted by F.

	By resolving the horizontal and vertical forces acting on the body we get R = W and F = P		By resolving the horizontal and vertical forces acting on the body, we get R = W and F = P

	=== Kinetic Friction ===		=== Kinetic Friction ===
	if the force P is increased further the body will start moving. The force of friction acting on the body, when the body is moving is called ''Kinetic Friction''.		if the force P is increased further, the body will start moving. The force of friction acting on the body, when the body is moving is called ''Kinetic Friction''.

	Coefficient of Friction (μ)		Coefficient of Friction (μ)
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	\|}		\|}

	=== ~~Ange~~ of Friction (Φ) ===		=== Angle of Friction (Φ) ===
	[[File:Angle of Friction.jpg\|alt=Fig 2. Angle of Friction\|thumb\|Fig 2. Angle of Friction]]		[[File:Angle of Friction.jpg\|alt=Fig 2. Angle of Friction\|thumb\|Fig 2. Angle of Friction]]
	Angle of friction is the angle made by the resultant of the normal reaction (R) and the limiting force of Friction (F) with the normal reaction (R) which is denoted by Φ. Fig 2. shows a solid body resting on a rough horizontal plane.		Angle of friction is the angle made by the resultant of the normal reaction (R) and the limiting force of Friction (F) with the normal reaction (R) which is denoted by Φ. Fig 2. shows a solid body resting on a rough horizontal plane.

alpha>Ramamurthy S: Citation added

2022-11-18T06:49:38Z

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	=== Laws of Dry Friction ===		=== Laws of Dry Friction ===

	# The force of friction acts in the opposite direction in which surface is having tendency to move.		# The force of friction acts in the opposite direction in which surface is having tendency to move.<ref>{{Cite book\|last=D P\|first=Sharma\|title=Applied Mechanics\|isbn=978-81-317-6486-2\|pages=2-21}}</ref>
	# The force of friction depends on the roughness of the surfaces in contact		# The force of friction depends on the roughness of the surfaces in contact
	#The force of friction is independent of the area of contact between two surfaces.		#The force of friction is independent of the area of contact between two surfaces.

alpha>Ramamurthy S: Citation added

2022-11-18T06:41:05Z

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	Based on the nature of two surfaces in contact friction is classified as		Based on the nature of two surfaces in contact friction is classified as

	* [[Static Friction]] - Two surfaces are in contact and at rest , the force experienced by one surface is called Static Friction.		* [[Static Friction]] - Two surfaces are in contact and at rest , the force experienced by one surface is called Static Friction.<ref>{{Cite book\|last=Mohan Das\|first=Madan\|title=Basic Engineering Mechanics and Strength of Materials\|publisher=PHI Learning Private Limited\|year=2010\|location=New Delhi\|pages=109}}</ref>
	* [[Dynamic Friction]] - One surface starts moving while the other is at rest , the force experience by the moving surface is called Dynamic Friction.		* [[Dynamic Friction]] - One surface starts moving while the other is at rest , the force experience by the moving surface is called Dynamic Friction.

alpha>Ramamurthy S: Citation added

2022-11-18T06:32:20Z

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	*# [[Solid Friction]] - When the two surfaces have sliding motion relative to each other , then the friction between the two surfaces is known as Solid Friction. Ex: friction occurring when we push a wooden box on the floor		*# [[Solid Friction]] - When the two surfaces have sliding motion relative to each other , then the friction between the two surfaces is known as Solid Friction. Ex: friction occurring when we push a wooden box on the floor
	*# [[Rolling Frictio]]<nowiki/>n - When one surface is rolling over another surface, then the friction between the two surfaces is known as Rolling Friction. Ex : friction between ball and roller bearing		*# [[Rolling Frictio]]<nowiki/>n - When one surface is rolling over another surface, then the friction between the two surfaces is known as Rolling Friction. Ex : friction between ball and roller bearing
	* [[Greasy Friction]] - When the two surfaces in contact have a very thin layer of lubricant between them, the friction between those surfaces is known as Greasy Friction. The lubricant is absorbed on the surfaces and forms a very thin film between these surfaces.		* [[Greasy Friction]] - When the two surfaces in contact have a very thin layer of lubricant between them, the friction between those surfaces is known as Greasy Friction. <ref>{{Cite book\|last=Kumar\|first=Vivek\|title=Dynamics of Machines\|publisher=Galgotia Publications Pvt. Ltd.\|year=2008\|location=New Delhi\|pages=136}}</ref>The lubricant is absorbed on the surfaces and forms a very thin film between these surfaces.
	* [[Viscous Friction]] - When the two surfaces in contact have a thick layer of lubricant between them, the friction between those surfaces is known as Viscous Friction. Here the surfaces do not come in contact and hence do not rub against each other. Surfaces will have rubbing action with the thick layer of lubricant only.		* [[Viscous Friction]] - When the two surfaces in contact have a thick layer of lubricant between them, the friction between those surfaces is known as Viscous Friction. Here the surfaces do not come in contact and hence do not rub against each other. Surfaces will have rubbing action with the thick layer of lubricant only.

alpha>Ramamurthy S: Content added

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-When a solid body slides over a stationary solid body, a force is exerted at the surface of contact by the stationary body on the moving body. This force is called as the ''force of friction'' and is always acting in the direction opposite to the direction of [[motion]]. ''Friction'' is a property of the bodies by virtue of which a force is exerted  by a stationary body on the moving body to resist the motion of the moving body.<ref>{{Cite book|last=Dr. R. K.|first=Bansal,|title=Theory of Machines|pages=210}}</ref> Friction acts parallel to the surface of contact and depends on the nature of surface of contact.
+When a solid body slides over a stationary solid body, a force is exerted at the surface of contact by the stationary body on the moving body. This force is called as the ''force of friction'' and is always acting in the direction opposite to the direction of [[motion]].
 The different contact surfaces are i) dry ii) partially lubricated (greasy) iii) completely lubricated (film lubricated).
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 Hence F = μR  ........................ (1)
 === Ange of Friction (Φ) ===

alpha>Ramamurthy S: Internal inks added

2022-11-15T01:06:22Z

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	Based on the nature of two surfaces in contact friction is classified as		Based on the nature of two surfaces in contact friction is classified as

	* Static Friction - Two surfaces are in contact and at rest , the force experienced by one surface is called Static Friction.		* [[Static Friction]] - Two surfaces are in contact and at rest , the force experienced by one surface is called Static Friction.
	* Dynamic Friction - One surface starts moving while the other is at rest , the force experience by the moving surface is called Dynamic Friction.		* [[Dynamic Friction]] - One surface starts moving while the other is at rest , the force experience by the moving surface is called Dynamic Friction.

	Based on the conditions of surfaces friction is classified as		Based on the conditions of surfaces friction is classified as

	* Dry Friction - The friction that exists between the two surfaces when no lubricant is used is called Dry Friction. It is further classified as		* Dry Friction - The friction that exists between the two surfaces when no lubricant is used is called Dry Friction. It is further classified as
	*# Solid Friction - When the two surfaces have sliding motion relative to each other , then the friction between the two surfaces is known as Solid Friction. Ex: friction occurring when we push a wooden box on the floor		*# [[Solid Friction]] - When the two surfaces have sliding motion relative to each other , then the friction between the two surfaces is known as Solid Friction. Ex: friction occurring when we push a wooden box on the floor
	*# Rolling ~~Friction~~ - When one surface is rolling over another surface, then the friction between the two surfaces is known as Rolling Friction. Ex : friction between ball and roller bearing		*# [[Rolling Frictio]]<nowiki/>n - When one surface is rolling over another surface, then the friction between the two surfaces is known as Rolling Friction. Ex : friction between ball and roller bearing
	* Greasy Friction - When the two surfaces in contact have a very thin layer of lubricant between them, the friction between those surfaces is known as Greasy Friction. The lubricant is absorbed on the surfaces and forms a very thin film between these surfaces.		* [[Greasy Friction]] - When the two surfaces in contact have a very thin layer of lubricant between them, the friction between those surfaces is known as Greasy Friction. The lubricant is absorbed on the surfaces and forms a very thin film between these surfaces.
	* Viscous Friction - When the two surfaces in contact have a thick layer of lubricant between them, the friction between those surfaces is known as Viscous Friction. Here the surfaces do not come in contact and hence do not rub against each other. Surfaces will have rubbing action with the thick layer of lubricant only.		* [[Viscous Friction]] - When the two surfaces in contact have a thick layer of lubricant between them, the friction between those surfaces is known as Viscous Friction. Here the surfaces do not come in contact and hence do not rub against each other. Surfaces will have rubbing action with the thick layer of lubricant only.

	=== Laws of Dry Friction ===		=== Laws of Dry Friction ===

alpha>Ramamurthy S: Citation added

2022-10-10T14:24:55Z

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	When a solid body slides over a stationary solid body, a force is exerted at the surface of contact by the stationary body on the moving body. This force is called as the ''force of friction'' and is always acting in the direction opposite to the direction of [[motion]]. ''Friction'' is a property of the bodies by virtue of which a force is exerted by a stationary body on the moving body to resist the motion of the moving body.<ref>{{Cite ~~web~~\|~~title~~=~~Friction\|url=https://www~~.~~oreilly~~.~~com/library/view/engineering-mechanics/9789332503489/xhtml/chapter004~~.~~xhtml#:~:text~~=~~This%20resisting%20force%20is%20called~~,~~moving%20body%20is%20called%20friction.~~}}</ref> Friction acts parallel to the surface of contact and depends on the nature of surface of contact.		When a solid body slides over a stationary solid body, a force is exerted at the surface of contact by the stationary body on the moving body. This force is called as the ''force of friction'' and is always acting in the direction opposite to the direction of [[motion]]. ''Friction'' is a property of the bodies by virtue of which a force is exerted by a stationary body on the moving body to resist the motion of the moving body.<ref>{{Cite book\|last=Dr. R. K.\|first=Bansal,\|title=Theory of Machines\|pages=210}}</ref> Friction acts parallel to the surface of contact and depends on the nature of surface of contact.

	The different contact surfaces are i) dry ii) partially lubricated (greasy) iii) completely lubricated (film lubricated).		The different contact surfaces are i) dry ii) partially lubricated (greasy) iii) completely lubricated (film lubricated).