lec17 - L ECTURE 17: H ITTING (D ESIRED T RAJECTORY )...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
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.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 4
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.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 30

lec17 - L ECTURE 17: H ITTING (D ESIRED T RAJECTORY )...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online