MIT2_00AJs09_lec02

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MIT OpenCourseWare http://ocw.mit.edu 2.00AJ / 16.00AJ Exploring Sea, Space, & Earth: Fundamentals of Engineering Design Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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Exploring Earth, Sea & Space: ± FUNdaMENTALs of Design ± Intro. To Engineering Analysis ±
Base Unit SI unit Mass [M] kg Length [L] m Time [T] s Temperature [ ] K Electric Current [I] Amps Amt of Matter [ mole ] Mol Units and Dimensions ± [UNITS??] F = ? g M 1 Newton = 1 kg*m/s [ Force ] = [ M * L * T -2 Always double check your units! ±

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Derived Units ± Derived Unit SI Units Area, A [ L 2 ] m 2 Volume, [ L 3 ] m 3 Velocity, v [ L T -1 ] m/s Acceleration, a [ L T -2 ] m/s 2 Pressure, p = F/A [ M L -1 T -2 ] N/m 2 = kg/m/s 2 Stress, ± [ M L -1 T -2 ] N/m 2 = kg/m/s 2 Force, F= p*A [ M L T -2 ] N = kg*m/s 2 Energy, E Work, W = F*x [M L 2 T -2 ] J = N*m Power, P = F*v [ M L 2 T -3 ] W = J/s = N*m/s Always double check your units! ±
Free Body Diagrams ALWAYS SKETCH IN± YOUR DESIGN NOTEBOOK! ± WHERE DO THE FORCES ACT? Images of a horse-drawn sleigh, a rock falling off a cliff, a crash-test dummy, and a hand holding a shoe removed due to copyright restrictions.

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