This document provides an introduction to engineering mechanics and its classifications. Engineering mechanics can be classified based on researchers into classical mechanics, relativistic mechanics, and quantum mechanics. It can also be classified based on the type of body into mechanics of rigid bodies, deformable bodies, and fluids. Additionally, engineering mechanics is divided into statics and dynamics. Statics deals with bodies at rest while dynamics considers bodies in motion, and can be further broken down into kinetics and kinematics.

1. Shaik Nayeem
Engineering Mechanics
Introduction: Classification
1
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2. • Engineering?
• Mechanics?
• Classification Based on Researchers
• Classical Mechanics
• Relativistic Mechanics
• Quantum Mechanics
• Classification
• Mechanics of Rigid bodies
• Mechanics of Deformable bodies
• Mechanics of Fluids
• Statics
• Dynamics
Contents

3. Engineering?
Engineering is the application of
mathematics, empirical evidence and scientific,
economic, social, and practical knowledge
in order to
invent, innovate, design, build, maintain, research,
and improve
structures, machines, tools, systems, components,
materials, processes and organizations
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4. Mechanics?
 The branch of applied physics
dealing with motion and forces
producing motion
or
 Mechanics is the science which
describes and predicts the
conditions of rest or motion of
bodies under the action of forces
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5. Classification Based on Researchers
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Mechanics
Classical Mechanics/Newtonian
Mechanics
Relativistic Mechanics
Quantum Mechanics/ Wave
Mechanics

6. Classical Mechanics
 Philosophy and experimental findings developed
around the state of rest and state of motion of the
bodies and put forth them in the form of three
laws of motion as well as the law of gravitation
 The mechanics based on these laws is called
Classical Mechanics or Newtonian Mechanics
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7. Relativistic Mechanics
 Albert Einstein proved that Newtonian mechanics
fails to explain the behaviour of high speed bodies
 He put the theory of Relativistic Mechanics
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8. Quantum Mechanics
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 Schrodinger and Broglie showed that Newtonian
mechanics fails to explain the behaviour of particle
when atomic distances are concerned
 They put forth the theory of Quantum Mechanics

9. Classification
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10. Mechanics of Rigid bodies
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11. Mechanics of Rigid bodies (Cont…)
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 Negligible deformation (no deformation) under the
action of forces
 Assuming 100% strength in the materials. Large
number of particles occupying fixed positions with
each other
 Actual structures and machines are never rigid
under the action of external loads or forces
 But the deformations induced are usually very
small which does not affect the condition of
equilibrium

12. Mechanics of Deformable bodies
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13. Mechanics of Fluids
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 Studying the behavior of fluid under various forces
and at different atmospheric conditions, and to
select the proper fluid for various applications

14. Statics
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15. Dynamics
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16. Dynamics( Cont…)
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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

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Thank You
Shaik Nayeem