# lec17 - L ECTURE 17 H ITTING(D ESIRED T RAJECTORY Hitting...

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L ECTURE 17: H ITTING (D ESIRED T RAJECTORY ) Hitting review (powerful swing) Recoil velocity Recoil angle and spin Effect of normal force Effect of friction Projectile motion with drag and lift

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The Register 1. Which factor is most relevant to longer club length? Strong club face? Light weight shaft? Stiff shaft? (a) Maximize velocity of club (b) Maximize mass of club (c) Minimize vibration of club (d) Maximize coefﬁcient of restitution (e) Optimal ﬁnal trajectory
Tiger Woods isn’t huge: why can he hit a golf ball so far? Why can small baseball hitters (like Hank Aaron) hit home runs effectively? 1. Average size players can be big hitters because (a) accuracy is more important than distance. (b) a smooth, well-coordinated swing is more important than a hard swing. (c) the collision time is short so the mass of the club/bat is unimportant. (d) you have to hit the ball on the sweet spot. (e) none of these.

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Air track demonstration of Conservation of Momentum: Inelastic Collision m=1 m=1 v=0 v=10 p=10 p=0 m=1 m=1 v=5 p=10 BEFORE AFTER p = 1 * 10 + 1 * 0 = 10 p =( 1+1) * 5 = 10 Need ± > 0 or throwing the ball harder gives less recoil velocity.
Air track demonstration of Conservation of Momentum: Elastic Collision m=1 m=1 v=0 v=10 p=10 p=0 m=1 m=1 v=0 v=10 p=10 p=0 BEFORE AFTER p = 1 * 10 + 1 * 0 = 10 p = 1 * 0 + 1 * 10 = 10 Even for ± = 1, the recoil is negligible for equal masses.

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M m Actual Collision v 1 v 2 v 1 -v 2 (Mv 1 - mv 2 )/(M+m) Center of Mass Velocity Relative Velocity Usually the “bat” is much more massive than the ball. ( M ± m ). For rigorous analysis, divide velocities into
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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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lec17 - L ECTURE 17 H ITTING(D ESIRED T RAJECTORY Hitting...

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