Presentation of Introduction to Engineering Mechanics

University of Babylon
College of Engineering
Department of Environmental Engineering
Engineering Analysis I (ENAN 103)







Introduction to Engineering Mechanics

Undergraduate Level, 1st Stage



Mr. Waleed Ali Tameemi
College of Engineering/ Babylon University
M.Sc. Civil Engineering/ the University of Kansas/ USA



2016-2017

Course Outline
1.0 Introduction
2.0 Parallelogram Law
3.0 Forces Resolution
4.0 Resultant of a Cunccurent, Coplanar Force System
5.0 Moment (Moment of a Force)
6.0 Couples
7.0 Resultant of a Non-concurrent, Coplanar Force System
8.0 Resultant of a Concurrent Non-coplanar Force System
9.0 Equilibrium
10.0 Fraction
11.0 Truss
11.1 Method of Joints
11.2 Method of Sections






1.0 – Introduction

Mechanics
It is the branch of physical science that deals with the state of rest or the state of motion of the bodies under the action of different forces. It utilizes for the analysis of rigid bodies under gravitational force and simple applied forces as well as the analysis of robotics, spacecraft under dynamic forces, temperature forces etc.
Scientist such as Archimedes (287–212 BC), Galileo (1564–1642), Sir Issac Newton (1642–1727) and Einstein (1878–1955) have significant contribution in the development of mechanics.
Force
It can be defined as any action that tends to change the state (rest or motion) of a body.
In order to completely define a force, three quantities are required and as follows:
1. Point of application
2. Direction of application
3. Magnitude
Force Types
1- Concentrated force/point load.



2- Distributed force.


Line of Action
It is the direction of a force that tends to move a body in that direction.

Force Representation
A force can be graphically representing by a segment of a straight line.



Force System
It is a number of forces acting on a body in a special manner. It can be classified depending on the forces’ line of action and as follows:
1- Coplanar or non-coplanar.
2- Concurrent or non-concurrent.
3- Parallel or non-parallel.
4- Collinear or non-collinear.
Rigid Body
It can be defined as a physical body in which all particles remains at fixed distances from each other. A body is called rigid body if its deformation is negligible as compared to its size. Mechanics deals only with rigid bodies.