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# class 28 - ENGR 111 Fall 2009 Class 28 ~ Week 14 1 Review...

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1 ENGR 111 Fall, 2009 Class 28 ~ Week 14

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2 Review Motion ~ Momentum ~ Energy Most important: • trigonometry • conservation laws • Newton’s Laws • other basic equations and problems from Physics • differentiating (finding a slope, for example) • integrating (finding an area, for example)
3 Motion Along a Known Path m • Orbit • Charpy Machine • Crank Look for: • constant velocity • subjected to gravitational force • Ski jump • Escalator • Conveyer x y v 0

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4 Trajectory Initial values could be: • position • slope • velocity • acceleration Governing equations: where: Not kinetic energy!
5 Numerical Solution Governing Equations: v 0 Initial conditions: θ 0 • Each index number, i, refers to a specific time. • Time interval is usually constant.

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6 Axle Wheel Forces F = mg Track T C D , A, ρ , m, g and T will probably be constants. F N F = μ F N F = μ 1 F N1 F = μ 2 F N2 F N1 F N2
7 Momentum Is momentum is conserved? • For a projectile in motion in vacuum and outside of a

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class 28 - ENGR 111 Fall 2009 Class 28 ~ Week 14 1 Review...

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