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ENGI 1313 Mechanics I

ENGI 1313 Mechanics I . Lecture 01: Course Introduction and General Principles. ENGI 1313 Resources. Textbook Engineering Mechanics Statics and Dynamics, 11 th Edition R.C. Hibbeler Pearson Prentice Hall (ISBN 0-13-221509-8). ENGI 1313 Resources. Statics Study Pack Chapter reviews

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ENGI 1313 Mechanics I

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  1. ENGI 1313 Mechanics I Lecture 01: Course Introduction and General Principles

  2. ENGI 1313 Resources • Textbook • Engineering Mechanics Statics and Dynamics, 11th Edition R.C. Hibbeler Pearson Prentice Hall (ISBN 0-13-221509-8)

  3. ENGI 1313 Resources • Statics Study Pack • Chapter reviews • Access to Pearson Prentice Hall website • wps.prenhall.com/esm_hibbeler_engmech_11

  4. 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

  5. ENGI 1313 Resources • General Websites • en.wikibooks.org/wiki/Statics • www.mun.ca/orientation/ • www.etipsforagrades.com • www.studygs.net/

  6. 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/

  7. Course Schedule • Lectures • Day: Mon., Tue., Wed. & Fri • Time: 0900-0950 • Location: IIC2001 • No Lectures • Oct. 8 & 9 Fall Break • Nov. 12 Remembrance Day

  8. Planned Lecture Schedule

  9. Course Perspective • Educational Process • Critical thinking • Making mistakes • Asking questions • Learning • Applying knowledge • Engagement • Professional development

  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

  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

  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

  13. Statics • Dynamics This course only examines Rigid Body Mechanics: Statics Introduction to Mechanics Mechanics Rigid Body Mechanics Deformation Mechanics Fluid Mechanics

  14. General Principles • Statics • Effect of loads on bodies in static equilibrium • Balanced loads • At rest or under motion at constant velocity

  15. General Principles • Kinematics • Effect of motion without consideration of loads

  16. General Principles • Dynamics • Effect of loads on bodies in motion • Unbalanced loads • Acceleration

  17. Brief Historical Perspective • Engineering Mechanics and Principles • Geometry • Empirical • Societal Applications • Military • Civilian • Shipbuilding

  18. Simple Machines • Inclined plane • Wedge • Screw • Lever • Pulley • Wheel and axle

  19. Simple Machines • Inclined Plane

  20. Simple Machines • Lever

  21. Simple Machines • Lever

  22. Fundamental Concepts • Idealizations • Particle • Constant mass • Negligible size

  23. P P Rigid Body P P Deformable Body Fundamental Concepts • Idealizations • Rigid Body • Combination of particles • Finite size • Relative position of particles remain fixed • No internal deformation

  24. Fundamental Concepts • Idealizations • Concentrated Force • Load effects acting at a point on a body • Load acts on small dimensions relative to body size

  25. Fundamental Concepts • Newton’s Laws of Motion • Basis of classical mechanics • Motion  Momentum • Massive, rigid body • Empirical • Inertial reference frame (no acceleration)

  26. V = 0, v F1 F3 F2 Fundamental Concepts • Newton’s 1st Law – Inertia • Particle equilibrium • Rest • Constant velocity • Unbalanced forces • External • Change in velocity, acceleration

  27. Fundamental Concepts • Newton’s 2nd Law – Acceleration • Object in motion • Unbalanced external forces • Acceleration • Proportional to force magnitude • Direction of applied net unbalanced force

  28. Fundamental Concepts • Newton’s 3rd Law – Reciprocal Action • Action   Reaction • To every action there is an equal and opposite reaction • Equal force magnitude • Opposite force sense or direction

  29. Fundamental Concepts • Newton’s Law of Gravitational Attraction • Point-to-point mass attraction through centers • Force  point mass 1 / distance2

  30. 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/s2

  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

  32. Fundamental Concepts • Forces • Type • Direct contact • Electromagnetic • Gravitational • Characteristics • Magnitude • Direction • Point of application

  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

  34. Units of Measurement • International System of Units • Unified, rational system • Units of measurement • Decimal system

  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 = 1 foot • 5280 feet = 1 mile • 16 ounces = 1 pound (mass) • Confusion on units • Pound force versus pound mass

  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)

  37. Units of Measurement • Derived Units • Physical laws • Base units • Compound Units • Area, volume

  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, ) • Consistent Use • Measurement  meters • Reporting  millimeters

  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

  40. Representative Problems • Hibbeler (2007) Textbook • Study Pack • Review questions 1 to 8

  41. 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

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