2. Fundamentals of Engineering – Honors – ENGR H191 Lecture 11 1 Question of the Day Why do Golf Balls have Dimples? ANSWER: To Make them fly farther! The Dimples change the aero- dynamics of the ball by making the airflow turbulent at the surface of the ball. This turbulence reduces the drag on the ball.

3. Fundamentals of Engineering – Honors – ENGR H191 Lecture 11 2 Topics For Today Drawing No. 20 is due Today’s Drawing: Space geometry Midterm Tuesday

4. Fundamentals of Engineering – Honors – ENGR H191 Lecture 11 3 Topics for Midterm on Tuesday Topics Orthographic projection drawings, i.e., 3-view drawings Isometric projection drawings Missing line(s) Missing view Graphing Space geometry

5. Fundamentals of Engineering – Honors – ENGR H191 Lecture 11 4 Topics for Midterm on Tuesday Four problems: 75% to be done by hand-sketching 25% to be done by Cadkey You will not be allowed to use any files from your disk for the CAD work

6. Fundamentals of Engineering – Honors – ENGR H191 Lecture 11 5 Today’s Assignment Dwg 21 & 22 – SG-6A Shortest connector between two lines, through a disk.  Worth two drawings Due at beginning of next lecture