class: manual-title, middle, title-slide-link name: title # Dissecting infield playability ### Evan C. Mascitti ### [PSU Center for Sports Surface Research](https://plantscience.psu.edu/research/centers/ssrc) ### [evan-soil.io](https://www.evan-soil.io) #### 7 April, 2021 <div class="baseball"> <img src="https://drive.google.com/uc?id=1lKrIWe3QaotbHZ0eJSC57UNf2mJTRAoh"> </div> <div class="logo-right"> <img src="https://drive.google.com/uc?id=1D9vCWG5hwmPL6n_WN9Hcu3X7JElyDf72"> </div> --- class: full-page-fig background-image: url(https://drive.google.com/uc?id=1CogUjvnfByj2bDPj3SO6Jnpp4UGqlVjA) background-size: contain # Concentration of play --- class: bg-road # Road map ### → Consistency ### → Pace + bounce + spin = "speed" ### → Hardness --- # Consistency - the last hop .center.middle[ <iframe width="880" height="410" src="https://www.youtube.com/embed/S67zqwz05ys?start=66&mute=1" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> ] --- class: full-page-fig background-image: url(https://drive.google.com/uc?id=1g_al0Boo7wutOyRVUZSpBMbAGjyZX9fx) background-size: contain # Corkboard --- # What _is_ speed? <div class="summation"> <p>pace +</p> <p>bounce +<p/> <p>spin</p> <hr> <p><strong>= perception</strong></p> </div> --- # Pace <br> .center[.middle[.threex[ `$$\mathrm{COR = \frac{incoming ~ velocity}{outgoing ~ velocity}}$$` ] ] ] --- background-image: url(https://drive.google.com/uc?id=1FUv2-DV6I5bWI0xz5_PJgufMQIAjORes) background-size: contain # Bounce --- layout:true # Spin --- .center.middle[  ] <br> Adapted from [Daish, 1972 - The Physics of Ball Games](https://www.goodreads.com/book/show/26599296-the-physics-of-ball-games) --- layout: false class: no-header, center, middle <iframe src="https://player.vimeo.com/video/531414292" width="1000" height="563" frameborder="0" allow="autoplay; fullscreen; picture-in-picture" allowfullscreen></iframe> --- layout: true # The only math in this talk ! --- .middle.center.pull-left.threex[ ## Friction `$$\mathrm{f=\mu \cdot N}$$` <img src="https://drive.google.com/uc?id=13E4JwZWoTvI2hvnCop2rJkZW81iGEyVw" width="40%" /> ] .middle.center.pull-right.threex[ ## Energy `$$\mathrm{E_k=mv^2}$$` <img src="https://drive.google.com/uc?id=13Uxo0glNMxkwzSCUhn-NkgFxWWAb6Dd3" width="35%" /> ] ??? ### Translation: - velocity > mass - ⏰ for friction ] --- layout:false # Ball-to-surface interaction .center[<span style="font-size:1.25em;">Time ~ 10 ms</span>]  --- layout:true # Hardness --- .pull-left[ <img src="https://drive.google.com/uc?id=132b6M6GCYLlfDb8lULLBoP6dLtdnPDcI" width="70%" style="display: block; margin: auto;" /> ] .pull-right[ - max acceleration experienced → `\(F=ma\)` - c.f. time to `\(Gmax\)` and SI/HIC ] --- .center[ .middle[ <iframe width="880" height="410" src="https://www.youtube.com/embed/SSod7rI0syg" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> ] ] --- class: full-page-fig background-image: url(https://drive.google.com/uc?id=1cdUcr0c9GJBDPirJK9lZvQWnImGWtm3f) # Hardness --- layout: false class: bg-road # Summary ### → Consistency ### → Pace + bounce + spin = "speed" ### → Hardness --- class: book-image # For further reference .pull-left[  [Daish, 1972 - The Physics of Ball Games](https://www.goodreads.com/book/show/26599296-the-physics-of-ball-games) ] .pull-right[  [SportsField Managment - March 2021](https://sportsfieldmanagementonline.com/2021/03/15/dissecting-infield-playability/12504/) ] --- class: no-header, center, middle # Questions .twentyx[?]