Chapter 1 Introduction of Mechanics

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VECTOR MECHANICS FOR ENGINEERS:

STATICS

CHAPTER

© 2007 The McGraw-Hill Companies, Inc. All rights reserved.

1Introduction




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Topic Outcomes

• Describe the fundamental concepts and principles of

engineering mechanics




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Contents

•Definition of Mechanics

•Fundamental Concepts

•Fundamental Principles

•Systems of Units




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What is Mechanics?

• Mechanics is the science which describes and

predicts the conditions of rest or motion ofbodies under the action of forces.

• Categories of Mechanics:- Rigid bodies

-Statics

- Dynamics- Deformable bodies- Fluids

• Mechanics is an applied science - it is notan abstract or pure science.

• Mechanics is the foundation of most engineeringsciences and is an vital prerequisite to theirstudy.



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Fundamental Concepts

• Space - associated with the position of a point P given interms of three lengths measured from a reference pointor origin. The lengths known as the coordinates of P.

• Time - definition of an event at which it occurred.

• Mass - used to characterize and compare bodies, e.g.,response to earth’s gravitational attraction andresistance to changes in translational motion.

• Force - represents the action of one body on another. A

force is represented by a vector.

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6 Fundamental Principles

1. ParallelogramLaw

2. Principle ofTransmissibility

The equilibrium or motion

of a rigid body isunchanged for force F orF’ with same magnitud,direction and line even at adifferent point

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6 Fundamental Principles-cont.

3. Newton’s First Law: If the resultant force on aparticle is zero, the particle will remain at rest orcontinue to move in a straight line.

4. Newton’s Second Law: A particle will have anacceleration, a proportional to a nonzeroresultant applied force, F.

am F

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6 Fundamental Principles-cont.

5. Newton’s Third Law: The forces of actionand reaction between bodies in contact havethe same magnitude, same line of actionwith opposite direction.

6. Newton’s Law of Gravitation: Two particles(M and m) attracted with equal but oppositeforces may have the magnitude F

mg W r MmG F

2

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Systems of Units

• Length, time, mass referred to as basic units, forcereferred to as a derived unit.

• International System of Units (SI): The basic units are length, time, and mass which

are arbitrarily defined as the meter (m), second(s), and kilogram (kg).

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END OF CHAPTER 1

THANK YOU

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Newton’s First Law

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Newton’s Second Law

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Newton’s Third Law

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Chapter 1 Introduction of Mechanics