Mechanics (1)
BAS 006
Lecture 1: Introduction
Prof. Dr. Mohamed Safwat Saad El-Din
Basic Science Engineering Department
2013
1
Eng.
Malek
Abuwarda
Prof.
M. Safwat
Lecture 1
Subject
 Grads:
Assignments
Midterm exam
Final exam
40%
20%
40%
 Course Materials
Lecture notes
Power points slides
Textbook
Engineering Mechanics: Statics 11th edition by
R.C. Hibbeler
2
Lecture 1
Eng.
Malek
Abuwarda
Prof.
M. Safwat
Instructional Objectives
 After completing the course, The student should be
able to:
Analyze forces and find out the resultant forces in two
and three dimension
Differentiate between various type of supports and
draw free-body-diagram
Compute the reaction force, internal forces and bending
moment at a specific point on a simple structure (beam, frame,
truss)
Obtain centre of mass and centroid for deferent
engineering shapes & moment of inertia for deferent
sections.
Types of friction, Characteristics of Dry Friction,
Theory of Dry Friction, Impending Motion, Motion
3
Lecture 1
Eng.
Malek
Abuwarda
Prof.
M. Safwat
Course Outline:
 Introduction to Statics
 Force System:
• Two-dimensional force systems.
• Three-dimensional force systems.
 Equilibriums:
• Equilibrium in two dimensions.
• Equilibrium in three dimensions.
 Structural Analysis:
Trusses Truss Analysis
The Method of Joints
Zero - Force Members
The Method of Sections
Beams
4
Lecture 1
Eng.
Malek
Abuwarda
Prof.
M. Safwat
Course Outline (cont.)
 Distributed Forces:
Centers of Mass and Centroids
Beams-External Effects
Beams-Internal effects
 Area Moments of Inertia
 Friction:
• Introduction
• Types of Friction
5
Eng.
Malek
Abuwarda
Prof.
M. Safwat
Lecture 1
Introduction to Mechanics
What is mechanics?
Physical science deals with the state of rest or motion
of bodies under the action of force
Mechanics
Statics
Dynamics
Kinematics
Kinatics
Why we study mechanics?
This science form the groundwork for further studies
in the design and analysis of structures
6
Lecture 1
Eng.
Malek
Abuwarda
Prof.
M. Safwat
Basic Terms
Essential basic terms to be understood
Particle: a body of negligible dimension
Rigid body: the relative movement between its parts
are negligible
Mass: the amount of matter in a body
Weight: the force with which a body is attracted
toward the centre of the Earth
Force: the action of one body on another whether it’s
a push or a pull force
Length: applied to the linear dimension of a strait line
or curved line
Area: the two dimensional size of shape or surface
Volume: the three dimensional size of the space
occupied by substance
7
Lecture 1
Eng.
Malek
Abuwarda
Prof.
M. Safwat
Units of Measurement
 Four fundamental quantities in mechanics:
• Mass (M)
• Length (L)
• Time (T)
• Force (F) = Mass x Acceleration = M x (L / T2)
 Two different systems of units:
• U.S. Customary or British System of Units (FPS)
• International System of Units or Metric Units (SI)
8
Lecture 1
Eng.
Malek
Abuwarda
Prof.
M. Safwat
The four fundamental quantities in the two system:
SI Units
US Units
Quantity
Unit
Symbol
Unit
Symbol
Mass
kilogram
kg
slug
slug
Length
meter
m
foot
ft
Time
second
s
second
sec
Force
newton
N
pound
lb
The standard value of g (gravitational acceleration)
SI units g = 9.806 m/s2
FPS units
g = 32.174 ft/sec2
9
Lecture 1
Eng.
Malek
Abuwarda
Prof.
M. Safwat