# lec12 - 1) In water polo, a soft throw often splats when it...

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1) In water polo, a soft throw often “splats” when it bounces on the water but a hard throw usually “skips.” Which one is the best answer? A. The coefficient of restitution is small for the “splat” but large for the “skip.” B. The coefficient of restitution is large for the “splat” but small for the “skip.” C. The coefficient of restitution is the same for the two cases; it’s the coefficient of friction that changes. 2) In a hard water polo bounce off the water, the horizontal velocity hardly changes, so we know that A. The coefficient of restitution is large. B. The coefficient of friction is large. C. The coefficient of restitution is small. D. The coefficient of friction is small. E. None of these.

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Note on Grades Mostly use an absolute scale (with adjustments if it seems unreasonable) . Tests Homework, Part., Warmup * Grade (Cutoff) 80% 90% A- 67% 80% B- 50% 70% C So, on Midterm, approximate letter grades are: 30 A-/B+ 25 B-/C+ 19 C/C- * after dropping lowest scores
L ECTURE 12: T ORQUE Torque (also called Moment) Equilibrium Levers

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Torque is the Force times the Lever Arm Hewitt
A longer lever arm produces more torque Wilson

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The perpendicular components determine the torque Hay
Variation of the lever arm (hence torque) in horizontal bar Dyson

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Directions of the torques on a bicycle wheel Brancazio
Treatment of two forces in calculating the net torque Hay/Dyson

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Increasing torque in platform diving Dyson.
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## This note was uploaded on 12/12/2011 for the course PHYS 17 taught by Professor Mcwilliams,r during the Fall '08 term at UC Irvine.

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lec12 - 1) In water polo, a soft throw often splats when it...

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