ENGI 1313 Mechanics I Lecture 01: Course Introduction and General Principles Shawn Kenny, Ph.D., P.Eng. Assistant Professor Faculty of Engineering and Applied Science Memorial University of Newfoundland spkenny@engr.mun.ca
ENGI 1313 Resources Textbook Engineering Mechanics Statics and Dynamics, 11 th Edition R.C. Hibbeler Pearson Prentice Hall (ISBN 0-13-221509-8) 2 2007 S. Kenny, Ph.D., P.Eng.
ENGI 1313 Resources Statics Study Pack Chapter reviews Access to Pearson Prentice Hall website wps.prenhall.com/ esm_hibbeler_engmech_11 3 2007 S. Kenny, Ph.D., P.Eng.
ENGI 1313 Resources MUN Engineering Instructor Website Course information www.engr.mun.ca/~spkenny/courses Professor contact information www.engr.mun.ca/~spkenny/contact Office Hours Mon. & Wed. (3-5PM) Other times can be scheduled by appointment 4 2007 S. Kenny, Ph.D., P.Eng.
ENGI 1313 Resources General Websites en.wikibooks.org/wiki/statics www.mun.ca/orientation/ www.etipsforagrades.com www.studygs.net/ 5 2007 S. Kenny, Ph.D., P.Eng.
Academic & Administrative Policies MUN Engineering Website Engineering exam policy http://www.engr.mun.ca/undergrad/ MUN Website University regulations http://www.mun.ca/regoff/calendar/ Student policies http://www.mun.ca/student/policies/ 6 2007 S. Kenny, Ph.D., P.Eng.
Course Schedule Lectures Day: Mon., Tue., Wed. & Fri Time: 0900-0950 Location: IIC2001 No Lectures Oct. 8 & 9 Fall Break Nov. 12 Remembrance Day 7 2007 S. Kenny, Ph.D., P.Eng.
Planned Lecture Schedule 8 2007 S. Kenny, Ph.D., P.Eng.
Course Perspective Educational Process Critical thinking Making mistakes Asking questions Learning Applying knowledge Engagement Professional development 9 2007 S. Kenny, Ph.D., P.Eng.
Course Perspective Fundamental Engineering Course Mechanics Foundation to build upon Work Ethic Regular study habits Lecture and tutorial schedule is known Critical thinking & problem solving Critical thinking & problem solving 10 2007 S. Kenny, Ph.D., P.Eng.
Objective of the Lecture Notes to explicitly follow the textbook to provide complement the textbook by providing additional worked examples to occasionally present complementary material that illustrates practical engineering applications of the theory 11 2007 S. Kenny, Ph.D., P.Eng.
Lecture 01 Objectives to introduce field of mechanics to introduce some fundamental concepts to review units of measurement and systems to provide guidance on engineering calculation procedures and analysis 12 2007 S. Kenny, Ph.D., P.Eng.
Introduction to Mechanics Mechanics Rigid Body Mechanics Deformation Mechanics Fluid Mechanics Statics Dynamics This course only examines Rigid Body Mechanics: Statics 13 2007 S. Kenny, Ph.D., P.Eng.
General Principles Statics Effect of loads on bodies in static equilibrium Balanced loads At rest or under motion at constant velocity 14 2007 S. Kenny, Ph.D., P.Eng.
General Principles Kinematics Effect of motion without consideration of loads 15 2007 S. Kenny, Ph.D., P.Eng.
General Principles Dynamics Effect of loads on bodies in motion Unbalanced loads Acceleration 16 2007 S. Kenny, Ph.D., P.Eng.
Brief Historical Perspective Engineering Mechanics and Principles Geometry Empirical Societal Applications Military Civilian Shipbuilding 17 2007 S. Kenny, Ph.D., P.Eng.
Simple Machines Inclined plane Wedge Screw Lever Pulley Wheel and axle 18 2007 S. Kenny, Ph.D., P.Eng.
Simple Machines Inclined Plane 19 2007 S. Kenny, Ph.D., P.Eng.
Simple Machines Lever 20 2007 S. Kenny, Ph.D., P.Eng.
Simple Machines Lever 21 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Idealizations Particle Constant mass Negligible size 22 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Idealizations Rigid Body Combination of particles Finite size Relative position of particles remain fixed No internal deformation P Rigid Body P P P Deformable Body 23 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Idealizations Concentrated Force Load effects acting at a point on a body Load acts on small dimensions relative to body size 24 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Newton s Laws of Motion Basis of classical mechanics Motion Momentum r r p = mv Massive, rigid body Empirical Inertial reference frame (no acceleration) 25 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Newton s 1 st Law Inertia Particle equilibrium Rest Constant velocity Unbalanced forces External Change in velocity, acceleration F 1 V = 0, v F 2 F 3 26 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Newton s 2 nd Law Acceleration Object in motion Unbalanced external forces Acceleration Proportional to force magnitude Direction of applied net unbalanced force r F = d dt r r ( mv ) = m a 27 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Newton s 3 rd Law Reciprocal Action Action Reaction To every action there is an equal and opposite reaction Equal force magnitude Opposite force sense or direction 28 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Newton s Law of Gravitational Attraction Point-to-point mass attraction through centers Force point mass 1 / distance 2 F = G m 1 r m 2 2 29 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Weight Force acting on particle due to gravity g = acceleration due to gravity Varies altitude, latitude not absolute Standard is 9.80665 m/s 2 m W = mg 2e = r m g 30 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Physical Quantities Characteristics Measurement process System of units Length (L) Distance, size Relative position of points in space Time (T) Sequence or succession of events Mass (M) Intrinsic property of matter Relative action between bodies 31 2007 S. Kenny, Ph.D., P.Eng.
Fundamental Concepts Forces Type Direct contact Electromagnetic Gravitational Characteristics Magnitude Direction Point of application 32 2007 S. Kenny, Ph.D., P.Eng.
Units of Measurement Standardized Quantity Physical Property Scientific method reproducible Economic and scientific drivers Historical Context Human body Examples: digit, palm, cubit Variability Examples: Arabic, Egyptian, Greek, Roman 33 2007 S. Kenny, Ph.D., P.Eng.
Units of Measurement International System of Units Unified, rational system Units of measurement Decimal system 34 2007 S. Kenny, Ph.D., P.Eng.
Units of Measurement Imperial and US Customary Similarities and differences Multiple units of measurement Length inch, foot, chain, furlong Mass grain, ounce, pound, Relatively more complex rules for conversion 12 inches 5280 feet 16 ounces = 1 foot = 1 mile = 1 pound (mass) Confusion on units Pound force versus pound mass 35 2007 S. Kenny, Ph.D., P.Eng.
Units of Measurement Base Units Fundamental structure for the system of units SI meter (m), kilogram (kg), second (s) FPS foot (ft), pound (lb), second (s) 36 2007 S. Kenny, Ph.D., P.Eng.
Units of Measurement Derived Units Physical laws Base units Quantity Symbol Base Units Dimension Force N kg m s -2 M L T -2 Pressure Pa kg m 2 s -2 M L 2 T -2 Energy J kg m -1 s -2 M L -1 T -2 Compound Units Area, volume 37 2007 S. Kenny, Ph.D., P.Eng.
Engineering Calculations Significant Figures and Rounding Measurement tools and error Basis of engineering data Precision versus accuracy Computational tools Numerical precision Constants (e.g. e, π) Consistent Use Measurement Reporting meters millimeters 38 2007 S. Kenny, Ph.D., P.Eng.
Engineering Analysis Problem Statement Objective Data and diagrams Known and unknown quantities Applicable Theory Assumptions, limitations and constraints Problem Solution Dimensionally homogeneous, consistent units Significant figures and rounding Assessment Engineering judgment, common sense 39 2007 S. Kenny, Ph.D., P.Eng.
Representative Problems Hibbeler (2007) Textbook Problem Set 1-1 to 1-16 1-17 to 1-20 Degree of Difficulty Easy Medium Estimated Time 5-10min 10-15min Study Pack Review questions 1 to 8 40 2007 S. Kenny, Ph.D., P.Eng.
References Hibbeler (2007) http://wps.prenhall.com/esm_hibbeler_engmech_1 http://en.wikipedia.org www.royalwwc2007.com http://www.liebherr.com/lh/ www.ultimaterollercoaster.com http://www.rlphotos.com/ http://www.world-mysteries.com/gw_tb_gp.htm http://www.starlight-theatre.ca/images/013.jpg http://www.slrugby.com 41 2007 S. Kenny, Ph.D., P.Eng.