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Unformatted text preview: 1 ME 242 Dynamics April 13, 2009 Eric Wang Todays Key Concepts Chapter 7: Kinetics of Rigid Bodies Types of motion Translation Curvilinear translation Rotation about a fixed point General motion Kinetics of Curvilinear translation Rotation about a fixed point Types of Motion Translation Curvilinear Translation Rotation about General Motion fixed point Pure Translation & Curvilinear Translation Equations of Motion for 2D: F = ma G M G = H G = F x = m x G F y = m y G (angular momentum is zero) Example (prob. 7.1.7) Given: L 1 = 1 m, L 2 = 1.8 m h = 0.65 m and m/s 2 Find: the change in the wheel normal forces due to thrust a G = 0.9 gi FBD=IRD mg N R N F ma G 2 No Thrust Case (baseline) Thrust Case Compare the results Rotation about a fixed point 2D Equations of motion F = ma G M G = H G F x = m x G F y = m y G M O = H O Always true for 2D Only true for 2D rotation about a fixed point...
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This note was uploaded on 09/19/2009 for the course ME 242 taught by Professor Kam during the Spring '06 term at Nevada.
- Spring '06