Law of coulomb friction, Mechanical Engineering

Assignment Help:

Law of coulomb friction:

Coulomb in the year 1781 presented certain conclusions which are called as Coulomb's law of friction. These observations are based on experiments on block tending to move on the flat surface without rotation. These laws are appropriate at condition of impending slippage or once the slippage has begun. The laws are enunciated below:

1. The total force of friction, which can be developed, is not dependent on area of contact.

2. For low relative velocities between the sliding bodies, the total amount of frictional force is not dependent on velocity. But force required to start the motion is greater than that needed to maintain the motion.

3. The total frictional force, which can be developed is proportional to the normal reaction of surface of contact.

So, coefficient of friction (µ) can be defined as the ratio of the   limiting force of friction (F) to normal reaction (R) between the two bodies.

Therefore,

µ = Limiting force of friction/ Normal reaction = F/R

or, F = µ.R, In general µ < 1

The factor affecting coefficient of friction are:

1. The material of meeting bodies.

2. The roughness or smoothness of the meeting bodies.

3. The   temperature of environment.

Efforts to minimize it:

1. The use of proper lubrication can minimize friction.

2. Proper polishing of the surface minimizes it.

 


Related Discussions:- Law of coulomb friction

Driveshaft seals, DRIVESHAFT SEALS Packed gland Sealed by several lay...

DRIVESHAFT SEALS Packed gland Sealed by several layers of asbestos or cotton yarn     Sometimes used two boxes with intervening space separated by steam Problems:     T

Theory of mechanics , analyze a six bar linkage to get the position, veloci...

analyze a six bar linkage to get the position, velocity and acceleration

Calculate the density of the composite, Five kilograms of continuous boron ...

Five kilograms of continuous boron fibers are introduced in a unidirectional orientation into 8 kg of an aluminum matrix. Calculate a.  the density of the composite b.

Future trends, Future Trends Ceramics and glasses contain wide ranging ...

Future Trends Ceramics and glasses contain wide ranging applications in domestic use and even wider application in manufacturing technology. The properties that are related wit

Safe access and location of buildings in plant design, The following items ...

The following items should be considered regarding the safe access and location of buildings: • The fire fighting pump house is usually located in a non-hazardous OSBL location

Force exerted on the pin - mechanics, Force exerted on the pin - Mechanics:...

Force exerted on the pin - Mechanics: Determin e x and y components of force exerted on the pin at A as shown in the figure given below. As there is a single strin

Explain the cushion materials which used in moulding sand, Q. Explain the C...

Q. Explain the Cushion Materials which used in moulding sand? These materials when added to the moulding sand burn and from gases when the molten metal is poured into the mould

Gas metal arc welding-principle of operation, GAS METAL ARC WELDING-PRINCIP...

GAS METAL ARC WELDING-PRINCIPLE OF OPERATION Gas Metal Arc Welding (GMAW) is one of the arc welding processes in which an electric arc is formed and maintained between a continuo

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd