9:00

• Questions?
• Feedback
  • How many drawings have you done?
  • Work on handwriting and removing the notes too quickly.
• Review of uncertainty
  • Gaussian distributions can model many real world observations
  • We can make predictions of quality, strenght, loads, etc in a stochastic manner.
  • Probabilities are the area under the Gaussian probaility density curve and are found by integration.
  • The book provides a table of probabilities for a nominal Gaussian curve.

9:05

Free Body Diagrams

• system: any isolated part or portion of a machine or structure
• used to isolate and identify both internal and external loads on a design element
• defines:
  • coordinate systems
  • known and unknown forces

\(\sum F = \frac{dp}{dt}\) and \(\sum M = \frac{dH}{dt}\)

Static Equilibrium (no velocity)

F = 0 and M = 0

9:15

Exercise: FBD Question

9:20

Example FBD

9:35

Question: FBD diagram question

9:45

• Questions?
• HW Questions?
• 50 designs due