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Physics 199BB The Physics of Baseball

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Physics 199BB The Physics of Baseball

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    1. Physics 199BB The Physics of Baseball Fall 2007 Freshman Discovery Course Alan M. Nathan 403 Loomis 333-0965 a-nathan@uiuc.edu

    5. Other Useful Books

    6. Other Useful Books

    7. Other Useful Books

    8. Internet Resources My web site: http://webusers.npl.uiuc.edu/~a-nathan/pob I try to keep the site up to date with the most current links PITCHf/x Gameday Logs http://gd2.mlb.com/components/game/mlb/year_2007/ Useful for analysis of pitched ball trajectories Hittracker http://www.hittrackeronline.com/ Useful for analysis of home run trajectories

    9. Organization of the Course Monday, 3-5 PM Rm. 236 Loomis Sometimes Rm. 257 Loomis (computer lab) Sometimes we will do “labs” High-speed camera Pitching machine “modal analysis” equipment Computer calculations … Hopefully we can watch the Illini practice

    10. What do I expect of you? Come to class Participate in discussion Do homework Mostly computer exercises Do a special project Research project, paper, presentation, … More on this later

    11. Additional Resources Physics of Baseball Blog: https://teamphysics.physics.uiuc.edu/SiteDirectory/PHYS199BBBlog/default.aspx Physics of Baseball Wiki: https://teamphysics.physics.uiuc.edu/SiteDirectory/PHYS199BBwiki/default.aspx Physics of Baseball Teamsite: https://teamphysics.physics.uiuc.edu/SiteDirectory/PHYS199BBTeam/default.aspx

    12. What matters more: pitch speed or bat speed? Does “juicing” the ball make a difference? What/where is the “sweet spot”? What is the ideal bat weight? Is corking the bat effective? Does the batter’s grip matter? Why does aluminum outperform wood? By how much? Can a curveball be hit farther than a fastball? After taking this course, you will be able to answer the following questions:

    13. After taking this course, you will be able to answer the following questions: Is there such a thing as a rising fastball? How much does a curveball break? How does a knuckleball work? What the heck is a gyroball? Why do fly balls often curve toward the foul line? Why are popups to the infield often difficult to catch? How far did that home run travel?

    15. More Philosophy Physics is an experimental science What tools are there at our disposal? The game itself—the ultimate laboratory Tools to study bats and batting Low speed collisions -- movie clip High speed collisions – movie clip Modal analysis of bat vibrations – demo and next slide Tools to study the flight of the baseball High-speed video – movie clip PITCHf/x – movie clip plus slide Trackman radar Motion analysis

    16. Note: nodes stack up at barrel end-->”sweet spot zone”Note: nodes stack up at barrel end-->”sweet spot zone”

    18. Barry Bonds’ 756th Home Run

    19. 19

    20. Using Motion Analysis to Study Baseball Trajectories

    22. Tuan fires ballTuan fires ball

    23. Typical Data Discuss analysis: Curvature?vertical acceleration >g for topspin, <g for backspin ?lift forceDiscuss analysis: Curvature?vertical acceleration >g for topspin, <g for backspin ?lift force

    24. Basic physics and math that we will review quickly: Velocity and acceleration Motion with constant acceleration: x(t) = x0 + v0t + 1/2at2 Forces and Newton’s Three Laws Especially the 2nd law F = ma Vectors Geometry and trigonometry

    25. First Assignment Read Chapters 1 and 2 of Adair Make sure you have Excel installed on your computer and know how to use it

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