### Friction and Its types

Friction and Its types. Static vs. Dynamic friction. Sliding vs. Rolling friction. Limiting friction. Coefficient of Friction.

A force acting in the opposite direction to the motion of the body is called force of friction or simply friction. It is of the following two types

1. Static friction ; and
2. Dynamic friction.

The friction, experienced by a body, when at rest, is known as static friction.

The friction experienced by a body, when in motion, is called dynamic friction. It is also called kinetic friction. It is of the following two types:

(a) Sliding friction ; and
(b) Rolling friction.

The friction, experienced by a body, when it slides over another body, is known as sliding friction.
The friction experienced by a body, when balls or rollers are interposed between the two surfaces, is known as rolling friction.

## Limiting Friction:

The maximum value of frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as limiting friction.

## Laws of Static Friction:

Following are the laws of static friction:
1. The force of friction always acts in a direction, opposite to that in which the body tends to move.
2. The magnitude of force of friction is exactly equal to the force, which tends the body to move.
3. The magnitude of the limiting friction bears a constant ratio to the normal reaction between the two surfaces.
4. The force of friction is independent of the area of contact between the two surfaces.
5. The force of friction depends upon the roughness of the surfaces.

## Laws of Dynamic or Kinetic Friction:

Following are the laws of dynamic or kinetic friction :
1. 1. The force of friction always acts in a direction, opposite to that in which the body tends to move.
2. The magnitude of the kinetic friction bears a constant ratio to the normal reaction between the two surfaces.
3. For moderate speeds, the force of friction remains constant. But it decreases slightly with the increase of speed.

## Coefficient of Friction:

It is defined as the ratio of limiting friction (F) to the normal reaction (RN) between the two bodies. It is generally denoted by Î¼. Mathematically,

### Are Engineers Favourite Among Girls?

What do girls think about men who are engineers and what type of engineers are most favourite among girls? A survey was conducted by a team of aboutmech with members chosen from different countries. Each team member carried out a neutral survey in his/ her country to evaluate what females think about most of the engineers from different engineering branches. An overview of different questions asked in survey is given below:

Question: Which male engineers do you find more attractive as a husband?
Almost 50% women voted for mechanical engineers to be the most attractive husbands among other engineers. So mechanical engineers are most favourite among girls as a husband. They find them more trustworthy, intelligent, and creative. A married women from California said, “If your husband is a mechanical engineer, he will help you in everyday tasks. Because mechanical engineers are good team players and they have creative ideas about everything.”

### Best CV Format for Mechanical Engineers

Fifty percent engineers fail to grab a dream job because of basic faults in their CVs/ Resume. This article tells you about best CV format for mechanical engineers and how you are supposed to design your CV when applying for jobs. You CV is your first impression on future employer. He/ she does not know you. Your CV is the only representation of your personality. He/ she may select or reject you after first glance on your resume.
I have experienced shortlisting and interviewing candidates for different jobs. I was astonished to learn that most of the candidates simply copy paste each others CVs without any changes at all. These types of CVs are rejected immediately. I am not trying to tell you that you should avoid copying, rather i ma telling you to refrain from giving your CV to your friends.
An ideal CV consists of following portions:
Name/ Address of the applicantObjectiveEducation RecordEmployment HistoryProfessional SkillsAwards & AchievementsCo-Curricular Activities/ Inter…

### Engineering Mechanics - Introduction

The Engineering Mechanics is that branch of Engineering-science which deals with the principles of mechanics along with their applications to engineering problems. It is sub-divided into the following two main groups:

(a) Statics, and (b) Dynamics

The Statics is that branch of Engineering Mechanics which deals with the forces and their effects, while acting upon the bodies at rest.

The Dynamics is that branch of Engineering Mechanics which deals with the forces and their effects, while acting upon the bodies in motion. It is further sub-divided into the following two branches:

(i) Kinetics, and (ii) Kinematics

The Kinetics is that branch of Dynamics, which deals with the bodies in motion due to the application of forces.

The Kinematics is that branch of Dynamics which deals with the bodies in motion without taking into account the forces which are responsible for the motion.