King Fahd University of Petroleum & Minerals Mechanical Engineering Dynamics ME 201 BY Dr. Meyassar N. Al-Haddad

Outline Department Mission Textbook Grading system Homework Attendance Exams Course Coverage Section 12.1 Introduction Vector and Scalar review Distance and Displacement review Speed and Velocity Examples

Department Mission The department is committed to providing highest quality education in mechanical engineering, conducting world-class basic and applied research, addressing the evolving needs of industry and society, and supporting the development of more competitive and new industry in the Kingdom of Saudi Arabia.

Textbook Engineering Mechanics, Dynamics R. C. Hibbeler, 10 th Edition & Dynamic Study Pack

Grading system 5%Attendance 10%Homework Assignments 20%1 st Major Exam 20%2 nd Major Exam 10%Quizzes 35%Final Exam

Homework Homework problems are pre-assigned in syllabus 5 problems every week. All homework problems assigned during a given week are due in class on the following Monday unless stated otherwise. Late Homework will not be accepted

Attendance Attendance will be checked during each lecture. The only acceptable excuse for absence is the one authorized by the Deanship of Student Affairs on their prescribed form. This excused should be presented to the instructor no later than one week following the resumption of class attendance. For any unexcused absence, 0.5 marks will be deducted from the attendance grade. Any student having more then 9 unexcused absences will receive a grade of DN for the course.

Office Hours Office Hours : –10:00 – 11:00 Every Day Location –Building 22 –Room233 Phone

Exam Days 1 st Major Exam (20%) –March – 22nd, 2005 (Room 6:125) 2 nd Major Exam (20%) – May- 9th, 2005 (Room 6:125) Final Exam (35%) –To Be Arranged by the registrar

Course coverage Kinematics of particle in various motion. (Chapter 12) –Force and acceleration. (Chapter 13) –Work and energy relations. (Chapter 14) –Impulse and Momentum. (Chapter 15) Kinematics of a rigid bodies in plane motion. (Chapter 16) –Force and acceleration of a rigid bodies. (Chapter 17) –Work and energy relations of a rigid bodies. (Chapter 18) –Impulse and Momentum of a rigid bodies (Chapter 19)

Areas of mechanics (Section12.1) Mechanics Rigid-body Static (CE201) Equilibrium body Dynamics (ME201) Accelerated motion body Kinematics (Geometric aspect of motion) ParticleRigid Body Kinetics (Analysis of force causing the motion) Work & Energy Impulse & Momentum Force & acceleration Deformable-bodyfluid

Areas of mechanics (section12.1) 1)Statics (CE-201) - Concerned with body at rest 2)Dynamics (ME-201) -Concerned with body in motion 1.Kinematics, is a study the geometry of the motion s, v, a 2.Kinetics, is a study of forces cause the motion F, m, motion

Review of Vectors and Scalars A Vector quantity has both magnitude and direction A Scalar quantity has magnitude only

Scalars (e.g)Scalars (e.g) –distance –speed –mass –temperature –pure numbers –time –pressure –area, volume –charge –energy Vectors (e.g.)Vectors (e.g.) –displacement –velocity –acceleration –force –weight (force) –momentum

Can be represented by an arrow (called the “vector”) Length of the vector represents the magnitude of the quantity Symbols for vectors: – (e.g. force) F,or F (bold type) Vectors F 2 F

Distance and Displacement 8km = Distance 3km = Displacement

DistanceDistance –total length of path travelled –must be greater than (or equal to) magnitude of displacement –only equal if path is straight –symbol d DisplacementDisplacement –direct distance –shortest distance between two points –distance between start and finish points –“as the crow flies” –can describe with only one direction –symbol s –s = x final - x initial

Average Speed and Average Velocity

Review av Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second?

Review a v Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second? t=0

Review a v Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second? t=1

Review a v Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second? t=2

Review a v Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second? t=3

Review a v Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second? t=4

Review a v Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second? t=5

Review a v Are you going up or down? Are you speeding up or slowing down? What will your velocity be in 1 second? t=6

Bungee Jumping

Motion 1

Motion 2

Motion 3 slowing

Motion 4 bottom

Motion 5 speeding up

Motion 6 Still rising

Motion 7 top

Velocity Acceleration bottom

Thank you