ENGINEERING MECHANICS

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Engineering Mechanics Made Easy GATE Handwritten Notes PDF

Engineering Mechanics Introduction :

The subject of Engineering Mechanics is that branch of Applied Science, which deals with the laws and principles of Mechanics, along with their applications to engineering problems. As a matter of fact, knowledge of Engineering Mechanics is very essential for an engineer in planning, designing and construction of his various types of structures and machines. In order to take up his job more skilfully, an engineer must pursue the study of Engineering Mechanics in a most systematic and scientific manner.

DIVISIONS OF ENGINEERING MECHANICS

The subject of Engineering Mechanics may be divided into the following two main groups:
1. Statics and 2. Dynamics.

STATICS

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

DYNAMICS

It is that branch of Engineering Mechanics, which deals with the forces and their effects, while acting upon the bodies in motion. The subject of Dynamics may be further sub-divided into the
following two branches :
1. Kinetics and 2. Kinematics.

KINETICS

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

KINEMATICS

It is that branch of Dynamics, which deals with the bodies in motion, without any reference to the forces which are responsible for the motion.

FUNDAMENTAL UNITS

The measurement of physical quantities is one of the most important operations in engineering. Every quantity is measured in terms of some arbitrary, but internationally accepted units, called fundamental units. All the physical quantities, met with in Engineering Mechanics, are expressed in terms of three fundamental quantities, i.e.
1. length 2. mass and 3. time.

FORCE

The force is an important factor in the field of Mechanics, which may be broadly defined as an agent which produces or tends to produce, destroys or tends to destroy motion. e.g., a horse applies force to pull a cart and to set it in motion. Force is also required to work on a bicycle pump. In this case, the force is supplied by the muscular power of our arms and shoulders.

EFFECTS OF A FORCE

A force may produce the following effects in a body, on which it acts :
1. It may change the motion of a body. i.e. if a body is at rest, the force may set it in motion. And if the body is already in motion, the force may accelerate it.
2. It may retard the motion of a body.
3. It may retard the forces, already acting on a body, thus bringing it to rest or in equilibrium.
4. It may give rise to the internal stresses in the body, on which it acts.