ME 242 Lecture 1 1.21 - 2 On with Dynamics ME 242 Dynamics...

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1 ME 242 Dynamics January 21, 2009 Eric Wang Associate Professor Mechanical Engineering Today’s outline • Introductions Course objectives • Syllabus Course outline Key concepts Course Objectives Be able to identify the type of dynamics problem Force Balance Impulse-Momentum Work-Energy Solve it The Syllabus & Outline See podcast & handouts Fridays will start at 12:05 Large Class Support Supplemental Instruction – Travis Fields – 2 sessions/week – Complete the WebCT survey Daily podcasts – Under 3 minutes – Key concepts for the day Office hours (PE119) – MW 2-3 – TR 1-2 Processing Breaks On average, adults need to stop every 10 minutes to “process” information Activities include: – 1-minute quiz/feedback – Pop quiz – Stretch/restroom break – Have a few students introduce themselves – A few minutes for reflection/ask the neighbor – Present a problem to be worked out in class Your job to remind me if I forget!
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2 On with Dynamics!
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Unformatted text preview: 2 On with Dynamics! ME 242 Dynamics Lecture #1 Eric Wang Associate Professor Mechanical Engineering Key ME242 Concepts • Particle, Rigid Body & System • Force & Moment • Mass & Inertia • Kinematics & Kinetics • Coordinate systems & Ref. frames • Momentum & angular momentum • Impulse & angular impulse • Energy • Work Today’s Key Concepts • 3 types of problems • Units • Mass & Inertia • FBD & IRD Type of Problems 1. Force balance (F=ma) – “now” questions 2. Impulse-momentum – Before & after – Collisions/impacts 3. Work-energy – Before & after – Time not involved Type of coordinates 1. Cartesian 2. Polar 3. Path 3 Units • Mass: kg, slug • Weight: N, lb • Force: N, lb • Inertia: kg * m 2 , slug * ft 2 • Some people use lbm and lbf Mass vs. Inertia Units • Mass: kg • Inertia: kg * m 2 (Mass moment of inertia) Q: What is mass? Q: What is inertia? FBD & IRD • FBD= Free Body Diagram • IRD = Inertial Response Diagram FBD = IRD...
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