ME 242 Lecture 6 02.02

ME 242 Lecture 6 02.02 - 1 ME 242 Dynamics February 2, 2009...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 ME 242 Dynamics February 2, 2009 Eric Wang Todays Key Concepts 2D Kinematics Path Coordinate 1D motion along a curve Path Coordinates The coordinate system moves with the car Tangential direction Normal direction e t e n e t Example: unicycle e n Center of Curvature & Radius of Curvature At any instant in time any curve can be approximated as a circular arc Normal Direction The normal unit vector always points towards the center of curvature 2 Velocity If radius is constant v p = ve t v p = r e r + r e r = r = v e t e e n e r Acceleration If radius is constant, then only have centripetal & tangential components Polar vs. Path a P = ( r r 2 ) e r + (2 r + r ) e r P / O = re r v p = r e r + r e No equivalent v p = ve t a P = v e t + v 2 r c e n Given: Ferris wheel has 30ft radius Magnitude of acceleration of P is 0.33 ft/s 2 Constant speed ride Find: Rotational speed Solution:...
View Full Document

Page1 / 3

ME 242 Lecture 6 02.02 - 1 ME 242 Dynamics February 2, 2009...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online