EngineeringMechanicsEngineeringMechanics
Lecture 1
4-12-2016
Course Syllabus
Warm welcome toeverybody
EngineeringCollege
University ofDuhok
1
Course:Engineering Mechanics
Grads:1st Semester Exam. 28%
Assignments 12%
Average Assignment 40%
Final exam 60%
Lecturer : Ms.Sc. AbdulJalil Sulaiman Ahmed
Assistant Lecturer : Ms.Sc. Edrees MohammedAhmed
2
CH-1. Introduction to Engineering Mechanics, CH-2. Force vectors CH-3. Equilibrium of a particle &rigid body CH-4. Force System Resultant, CH-5. Internal forces &Structural Analysis, CH-6. Friction. CH-7. Centroid and Center of Gravity, CH-8. Moment of Inertia, First Semester CH-1. Introduction to Engineering Mechanics, CH-2. Force vectors CH-3. Equilibrium of a particle &rigid body CH-4. Force System Resultant, CH-5. Internal forces &Structural Analysis, CH-6. Friction. CH-7. Centroid and Center of Gravity, CH-8. Moment of Inertia,
3
Textbooks
◦Engineering Mechanics: Statics 5th editionby J.L. Meriam & L.G. Kraige
◦Engineering Mechanics: Statics &Dynamics13th edition. By R. C. Hibbeler
4
CH-1Introduction to MechanicsCH-1Introduction to Mechanics
What is mechanics?
Physical science deals with the state of rest ormotion of bodies under the action of force
5
Why we study mechanics?
This science form the ground work for furtherstudy in the design and analysis of structures
Branchs of Mechanics
6
Mechanics
Rigid body
Mechanics
Statics
Kinetics
Deformable body
Mechanics
Fluid
Mechanics
Kinematics
Dynamics
Fundamental Concepts :
Statics: Science which deals with theequilibrium of a body at rest or moving withconstant velocity.
Dynamics: Science which deals withaccelerated motion of bodies .
Rigid body: The combination of a largenumber of particles , the relative movementbetween its parts remain constant ornegligible.
7
•Space - associated with the position of apoint P given in terms of three coordinatesmeasured from a reference point or origin.
• Force: Action of one body on anothermay be push or a pull force. ( F =ma )
•Weight: Force which attract the bodytoward the centre of the Earth. (W=mg )
•Particle: A body have a mass withnegligible dimension.
8
systems of units
U.S. or British System Units (FPS)
Length in feet.inch (ft, in), ( ‘ , “ )
Time in Seconds (s)
Force in Pounds, Kip (lb, K)
International System or Metric Units(SI)
Length in metre, millimetre, (m, mm )
Time in Seconds (s)
Force in Newton, Kilo newton (N, kN)
9
Metric System (SI)
◦Newton’s second law F = m.a
Force (N) = mass (kg) acceleration (m/s2)
◦Newton is the force required to give amass of 1 kg an acceleration of 1 m/s2
U.S. Customary System (FPS)
◦Force (lb)=mass(slug)acceleration(ft/sec2 )
Slug = lb.sec2/ft
◦Slug is the mass give an acceleration of 1ft/sec2 when acted upon by a force of 1 lb
10
Conversion of Units
Converting from one system of unit to another;
11
SI
FPS
Quantity
4.448 N
1 lb
Force
14.593 kg
1 slug
Mass
0.304 m
1 ft
Length
The standard value of g (gravitational acceleration)
SI unitsg = 9.806 m/s2
FPS units g = 32.174 ft/sec2
Discussions
12