### Force - Basic Definition

Force may be defined as an agent which produces or tends to produce, destroy or tends to destroy the motion of a body. A force while acting on a body may

(a) change the motion of a body,
(b) retard the motion of a body,
(c) balance the forces already acting on a body, and
(d) give rise to the internal stresses in a body.

In order to determine the effects of a force acting on a body, we must know the following characteristics of a force:

(i) The magnitude of the force,
(ii) The line of action of the force,
(iii) The nature of the force, i.e. push or pull, and
(iv) The point at which the force is acting.

In M. K. S. system of units, the magnitude of the force is expressed in kilogram-force (briefly written as kgf) and in S.I. system of units, the force is expressed in newtons (briefly written as N). It may be noted that

1 kgf = 9.81 N

1. can we have all the materials in pdf format

2. Nice explanation

3. you are doing great job...a true mechanical engineer..keep it up

### 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.” Which male engineers do you find mo

### 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.