introduction engineering mechanics shivayogi patil thontadarya college engineering s1

7/30/2019 Introduction Engineering Mechanics Shivayogi Patil Thontadarya College Engineering S1

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Session 1Session Name: Introduction to Engineering

MechanicsAuthor Name: Shivayogi. PatilDepartment: Civil Engineering

Subject/Course: Engineering Mechanics


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Page 2 Ver 1:.01 Introduction to Engineering MechanicsShivayogi. C . Patil Thontadarya College of Engineering

Session Objectives

At the end of this session, the learner will be able to:

Clearly understand the meaning of Engineering Mechanics and

appreciate its applications.

Get an over view of different branches of Engineering Mechanics.

Clearly understand the meaning of several tec hnical terms in Engineering

Mechanics.

Learn the contributions of different scientists for Engineering Mechanics.Identify basic Idealizations made in Engineering Mechanics.

Learn to specify a force completely.

Teaching Learning Material

Board

OHP

Foot ball


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Introduction to Engineering Mechanics Page 3Shivayogi. C . Patil Thontadarya College of Engineering

Session Plan

Time(in min)

ContentLearning Aid

and

Methodology

FacultyApproach

Typical StudentActivity

Learning Outcomes(Blooms + Gardeners)

10

Introduction toEngineering mechanics,Its meaning and itsapplications.

Slide ShowInnovativeintro

ExplainsListensParticipates

Remembering VerbalKinestheticIntrapersonalInterpersonal

05

An overview of branchesof EngineeringMechanics

Slide showusing OHP

Explains ListensComprehensionIntrapersonalVisual

10

Definitions of Force,Mass , Weight, Inertia

Gravity and there units .

Role Play /Board

Introduces

RememberingSpatial intelligenceIntrapersonalInterpersonal

05

Categories inEngineering Mechanicsbased on thecontribution by variousscientists.

OHP / Board Explains ListensComprehensionInterpersonalIntrapersonal

15

Discussion on BasicIdealizations made inEngineering mechanics

OHP / Board Explains Listens

ApplicationComprehensionInterpersonalIntrapersonal

10 Conclusion Recall Summarize Lists IntrapersonalComprehension


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Session Inputs

Introduction to Engineering Mechanics

It would be a good idea to start the session with an activity that

would help us introduce the topic to the learners.

Suggested Activity: Practical Demonstration

Activity 1. Dribbling of a food ball to show how force applied on a body willset it into motion :

Learners can be asked to dribble a foot ball on ground. The bouncing of

ball will make it easier to explain the concept of force and the motion it

produces when applied on a body, which can be explained as below.

Force: Force is an agency which produces or tends to produce or stops ortends to stop the motion of a body on which its applied. Force is exerted

when one body comes into contact with other body. The two bodies in

contact exert force on each other. When such a force is big enough to

over come the inertia of the one of the body, that body will be set into

motion.

Here the foot ball is one body and our hands and ground are other bodies.

Activity 2: Kicking/pushing and stopping a foot ball.

A learner can be made to kick or push a ball slowly and another learner

can be suggested to stop the ball using his leg. This will explain the property

of a force which can both produce or stop the motion of a body.

Conclusion: Engineering mechanics is the study of such bodies which are

set into motion by the application of external forces.

Engineering Mechanics is that branch of science which deals with

forces and the motion of bodies under the application of these

forces. When a force is applied on a body, it is set into motion if it

is suffic ient to overcome the inertia of the body. If the body is


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already in motion then the applied force may accelerate the

motion if its direction is same as the motion of the body, or it may

tend to destroy the motion of moving body if its direction is

opposite to that of motion.

Mechanics is the study of forces, application of forces on bodies

and the resulting motion of the body

A Force may be a PUSH or a PULL.

In a bicycle force (Push) applied on pedals will be transferred to

its wheels through a chain and is set into motion.

In an automobile a force is exerted on its wheels by the

conversion of one form of energy into another form of energy .

Hence all the machines invented so far works on the principles ofMechanics. A force is exerted when two bodies meet or interact

which results into the motion of either any one or both the bodies

PULL

PUSH

PUSH


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Mechanics is the study of forces and the motion of body due to

application of these forces. A force may be a Push or a Pull.

Branches of Engineering Mechanics

Having introduced basic concept of Engineering Mechanics, nowit would be time to discuss the branches of Engineering

Mechanics.

Dynamic

Mechanics of

Deformable

Mechanics of

Ri id Bodies

Static

Compressibl

e fluid

Incompre

ssible

fluid

Mechanics

Kinetics Kinematics

F= Mg


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Definition of Force, Mass, Weight and Inertia

By now the learners would have developed a clear idea about

branches of Engineering Mec hanics. At this point, it would beappropriate to take up the definition of force, mass, weight and

inertia with the help of a role play.

Suggested Activity: Role Play

To execute the role play, we ask four learners to play the roles of Force,

rigid bodies one with light weight and one with heavy weight.

The aim of the role play will be to demonstrate how force acting on a rigid

body set it into a motion if it is able to overcome the inertia of the body.

It also demonstrates how the force applied fails to set the body into motion

if it can not overcome the inertia of the body. It also establishes relation

ship between mass, weight and inertia of the body.

Scene 1: A boy with light weight representing a rigid body with light weightstands on the centre of stage. Another boy representing the force pushes

the boy forward which sets the boy representing rigid body into motion.

Scene 2: Another boy of heavy weight representing a rigid body of heavy

weight takes the center stage now. Again the boy representing the forcepushes this boy but is un able to move the boy. This shows that the applied

force by the boy is unable to over come the inertia of the body of another

boy. This also establishes that inertia of the body depends on the weight of

the body.

Scene 3: Third boy who represent a body in motion takes the centre stage

now and keeps on moving on stage in circles. The boy representing force

applies a push on his back which will accelerate the speed of the boy in

motion. This demonstrates that a force applied on a moving body in the

same direc tion of its motion will accelerates the speed of motion of body.

Scene 4: Here the boy representing the force apply a force on the boy in

motion in the direction opposing the motion of he boy, This time the boy in

motion stops. This demonstrates that if the force is applied to a body in a

direction opposite to the motion of the body it stops / destroys or at least


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tends to destroy the force.

Conclusion: A Force is an agency which creates or tends to create,destroys or tends to destroy the motion of a body on which its applied. It

also demonstrates that the force applied must overcome the inertia of the

body to set into motion and inertia of a body depends on its weight.

Categories in Engineering Mechanics Based on the Contribution ofVarious Scientists

We can now understand the Categories in Engineering

Mechanics Based on the Contribution of Various Scientists.

Scientists who contributed to the growth of Engineering

Mechanics are:

Sir Isaac Newton

Albert Einstein.

Archimedes

Galileo

Shrodinger and Broglie.

1. Classical Mechanics / Newtonian Mechanics - Putforth by Newton and based on Newtons laws of

motion and gravity.

2. Relativistic Mechanics - Based on theory ofRelativity by Albert Einstein.

3. Quantum Mechanics - Based on Quantum theoryput forth by Shrodinger and Broglie

For all practical purpose we use Classical or Newtonian

Mechanics to solve the problems of Engineering Mechanics.

Basic Idealizations Made in Engineering Mechanics

Let us now discuss the basic idealizations Made in Engineering

Mechanics.


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To solve the problems of Engineering Mechanics easily following

Ideals conditions has been assumed about bodies which are

practically impossible to exist. Those idealizations are

1. Particle : Its a body with only mass but no size. Every bodyis made up of such millions of particles. There size is

neglected compared to distance between them especially

when calculating force of attraction between them.

2. Continuum: For solving the problems in EngineeringMechanics easily we assume a rigid body as a continuous

distribution of mass called Continuum instead of aconglomerate of discrete particles.

3. Rigid body: A rigid body is one which does not deformunder the action of applied forces. That means the

distance between any two points in a rigid body remainsconstant even under the action of external forces

4. Point force: A force is assumed to act at a single point andits contact area is neglected.

Conglomerate Continuum Rigid body particle Of

Particles.

Conclusion

We can conclude the session by asking the learners to recall the

topics which we have discussed in todays class.


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Summary

In this session, we learnt to:

Clearly understand the meaning of Engineering Mechanics and

appreciate its applications.

Get an over view of different branches of Engineering Mechanics.

Clearly understand the meaning of several tec hnical terms in Engineering

Mechanics.

Learn the contributions of different scientists for Engineering Mechanics.Identify basic Idealizations made in Engineering Mechanics.

Learn to specify a force completely.


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Assignment

1. Define the terms a) Force , b) Mass , c) Weight , d) Inertia2. Explain the importance of Engineering Mechanics and its various

branches.

3. On what basis the Engineering Mechanics is classified / categorized.4. Discuss the basic idealizations made in Engineering mechanics to make it

easier to solve the problems.

5. Discuss how a force can be specified completely with an example.


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References

Elements of Engineering and Engineering Mechanics by S.S.Bhavikatti.

Elements of Engineering and Engineering Mechanics by Dr. B. C .

Punmia

introduction engineering mechanics shivayogi patil thontadarya college engineering s1

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