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Fall 2007  Phys 5A  9/7  Lecture 1.8  50 minutes
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"Gravity is a contributing factor in nearly 73 percent 
of all accidents involving falling objects."
--Dave Barry

TODAY
Clicker homework
     [Open-notes, book open only to problems, "closed-mouth"]

Ch. 2.7: Free Fall (*.pdf)
     Examples: Problem 2.44
               Problem 2.54(b) 
     Weblink: Quadratic Equation Solver (mathisfun.com)
     Shockwave video: "Jumping Out of Windows [Into Snow]"
     (source unknown; adult language; do NOT attempt this!)

NEXT TIME
Homework 
     Problem 2.54(a) (hint: what is v_y at the highest height above the ground?)
     Read Ch. 3.2 (no "read-ahead" questions; 
                   skim Figure 3.6 for trigonometry review)        

Problem-Solving Session(s)
     Comprehensive Problems 2.56
                            2.60
                            2.62
                            2.66(a)-(b) ("9.80 N/kg" is 9.80 m/s^2)
                            
     (Lec. 1.9: choose hardest to be done as example, easiest one for credit)
     (Lec. 1.10: choose another to be done as example, remaining one for credit)