ENGI 1313 Mechanics I
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1 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
2 ENGI 1313 Resources Textbook Engineering Mechanics Statics and Dynamics, 11 th Edition R.C. Hibbeler Pearson Prentice Hall (ISBN ) S. Kenny, Ph.D., P.Eng.
3 ENGI 1313 Resources Statics Study Pack Chapter reviews Access to Pearson Prentice Hall website wps.prenhall.com/ esm_hibbeler_engmech_ S. Kenny, Ph.D., P.Eng.
4 ENGI 1313 Resources MUN Engineering Instructor Website Course information Professor contact information Office Hours Mon. & Wed. (3-5PM) Other times can be scheduled by appointment S. Kenny, Ph.D., P.Eng.
5 ENGI 1313 Resources General Websites en.wikibooks.org/wiki/statics S. Kenny, Ph.D., P.Eng.
6 Academic & Administrative Policies MUN Engineering Website Engineering exam policy MUN Website University regulations Student policies S. Kenny, Ph.D., P.Eng.
7 Course Schedule Lectures Day: Mon., Tue., Wed. & Fri Time: Location: IIC2001 No Lectures Oct. 8 & 9 Fall Break Nov. 12 Remembrance Day S. Kenny, Ph.D., P.Eng.
8 Planned Lecture Schedule S. Kenny, Ph.D., P.Eng.
9 Course Perspective Educational Process Critical thinking Making mistakes Asking questions Learning Applying knowledge Engagement Professional development S. Kenny, Ph.D., P.Eng.
10 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 S. Kenny, Ph.D., P.Eng.
11 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 S. Kenny, Ph.D., P.Eng.
12 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 S. Kenny, Ph.D., P.Eng.
13 Introduction to Mechanics Mechanics Rigid Body Mechanics Deformation Mechanics Fluid Mechanics Statics Dynamics This course only examines Rigid Body Mechanics: Statics S. Kenny, Ph.D., P.Eng.
14 General Principles Statics Effect of loads on bodies in static equilibrium Balanced loads At rest or under motion at constant velocity S. Kenny, Ph.D., P.Eng.
15 General Principles Kinematics Effect of motion without consideration of loads S. Kenny, Ph.D., P.Eng.
16 General Principles Dynamics Effect of loads on bodies in motion Unbalanced loads Acceleration S. Kenny, Ph.D., P.Eng.
17 Brief Historical Perspective Engineering Mechanics and Principles Geometry Empirical Societal Applications Military Civilian Shipbuilding S. Kenny, Ph.D., P.Eng.
18 Simple Machines Inclined plane Wedge Screw Lever Pulley Wheel and axle S. Kenny, Ph.D., P.Eng.
19 Simple Machines Inclined Plane S. Kenny, Ph.D., P.Eng.
20 Simple Machines Lever S. Kenny, Ph.D., P.Eng.
21 Simple Machines Lever S. Kenny, Ph.D., P.Eng.
22 Fundamental Concepts Idealizations Particle Constant mass Negligible size S. Kenny, Ph.D., P.Eng.
23 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 S. Kenny, Ph.D., P.Eng.
24 Fundamental Concepts Idealizations Concentrated Force Load effects acting at a point on a body Load acts on small dimensions relative to body size S. Kenny, Ph.D., P.Eng.
25 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) S. Kenny, Ph.D., P.Eng.
26 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 S. Kenny, Ph.D., P.Eng.
27 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 S. Kenny, Ph.D., P.Eng.
28 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 S. Kenny, Ph.D., P.Eng.
29 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 S. Kenny, Ph.D., P.Eng.
30 Fundamental Concepts Weight Force acting on particle due to gravity g = acceleration due to gravity Varies altitude, latitude not absolute Standard is m/s 2 m W = mg 2e = r m g S. Kenny, Ph.D., P.Eng.
31 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 S. Kenny, Ph.D., P.Eng.
32 Fundamental Concepts Forces Type Direct contact Electromagnetic Gravitational Characteristics Magnitude Direction Point of application S. Kenny, Ph.D., P.Eng.
33 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 S. Kenny, Ph.D., P.Eng.
34 Units of Measurement International System of Units Unified, rational system Units of measurement Decimal system S. Kenny, Ph.D., P.Eng.
35 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 S. Kenny, Ph.D., P.Eng.
36 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) S. Kenny, Ph.D., P.Eng.
37 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 S. Kenny, Ph.D., P.Eng.
38 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 S. Kenny, Ph.D., P.Eng.
39 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 S. Kenny, Ph.D., P.Eng.
40 Representative Problems Hibbeler (2007) Textbook Problem Set 1-1 to to 1-20 Degree of Difficulty Easy Medium Estimated Time 5-10min 10-15min Study Pack Review questions 1 to S. Kenny, Ph.D., P.Eng.
41 References Hibbeler (2007) S. Kenny, Ph.D., P.Eng.
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