Modern Tennis Technique of Sliding
<p><span word="Sliding">Sliding</span> <span word="to">to</span> <span word="return">return</span> <span word="a">a</span> <span word="shot">shot</span> <span word="is">is</span> <span word="a">a</span> <span word="common">common</span> <span word="tennis">tennis</span> <span word="practice">practice</span> <span word="on">on</span> <span word="clay">clay</span> <span word="courts">courts</span>, <span word="but">but</span> <span word="lately">lately</span> <span word="players">players</span> <span word="have">have</span> <span word="started">started</span> <span word="using">using</span> <span word="it">it</span> <span word="on">on</span> <span word="grass">grass</span> <span word="and">and</span> <span word="hard">hard</span> <span word="courts">courts</span> <span word="as">as</span> <span word="well">well</span>. <span word="Scientists">Scientists</span> <span word="say">say</span> <span word="it">it</span> <span word="is">is</span> <span word="faster">faster</span> <span word="than">than</span> <span word="running">running</span> <span word="and">and</span> <span word="allows">allows</span> <span word="athletes">athletes</span> <span word="to">to</span> <span word="change">change</span> <span word="direction">direction</span> <span word="more">more</span> <span word="quickly">quickly</span>.</p><p>"<span word="The">The</span> <span word="speed">speed</span> <span word="of">of</span> <span word="the">the</span> <span word="game">game</span> <span word="has">has</span> <span word="increased">increased</span> <span word="a">a</span> <span word="lot">lot</span> <span word="because">because</span> <span word="the">the</span> <span word="players">players</span> <span word="are">are</span> <span word="serving">serving</span> <span word="faster">faster</span> <span word="than">than</span> <span word="years">years</span> <span word="before">before</span>," <span word="said">said</span> <span word="Daniel">Daniel</span> <span word="Ura">Ura</span>, <span word="a">a</span> <span word="researcher">researcher</span> <span word="in">in</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Sheffield">Sheffield</span>'<span word="s">s</span> <span word="Department">Department</span> <span word="of">of</span> <span word="Mechanical">Mechanical</span> <span word="Engineering">Engineering</span>. "<span word="It">It</span> <span word="could">could</span> <span word="be">be</span> <span word="because">because</span> <span word="of">of</span> <span word="the">the</span> <span word="materials">materials</span> <span word="of">of</span> <span word="the">the</span> <span word="rackets">rackets</span>, <span word="or">or</span> <span word="could">could</span> <span word="be">be</span> <span word="the">the</span> <span word="strings">strings</span> <span word="as">as</span> <span word="well">well</span>. <span word="But">But</span> <span word="I">I</span> <span word="think">think</span> <span word="it">it</span>'<span word="s">s</span> <span word="a">a</span> <span word="necessity">necessity</span> <span word="of">of</span> <span word="the">the</span> <span word="players">players</span> <span word="to">to</span> <span word="reach">reach</span> <span word="the">the</span> <span word="ball">ball</span> <span word="faster">faster</span>."</p><p><span word="So">So</span> <span word="far">far</span>, <span word="only">only</span> <span word="a">a</span> <span word="few">few</span> <span word="top">top</span> <span word="players">players</span> <span word="have">have</span> <span word="mastered">mastered</span> <span word="the">the</span> <span word="technique">technique</span> <span word="off">off</span> <span word="clay">clay</span>. <span word="For">For</span> <span word="effective">effective</span> <span word="slides">slides</span>, <span word="the">the</span> <span word="shoes">shoes</span> <span word="must">must</span> <span word="perfectly">perfectly</span> <span word="match">match</span> <span word="the">the</span> <span word="court">court</span>'<span word="s">s</span> <span word="surface">surface</span>, <span word="and">and</span> <span word="this">this</span> <span word="is">is</span> <span word="where">where</span> <span word="the">the</span> <span word="science">science</span> <span word="comes">comes</span> <span word="in">in</span> <span word="handy">handy</span>.</p><p>"<span word="I">I</span> <span word="think">think</span> <span word="it">it</span> <span word="will">will</span> <span word="become">become</span> <span word="more">more</span> <span word="like">like</span> <span word="a">a</span> <span word="Formula">Formula</span> 1 <span word="race">race</span> <span word="probably">probably</span>," <span word="Ura">Ura</span> <span word="said">said</span>, <span word="with">with</span> <span word="the">the</span> <span word="right">right</span> <span word="shoe">shoe</span> <span word="depending">depending</span> <span word="on">on</span> <span word="the">the</span> <span word="weather">weather</span> <span word="or">or</span> <span word="the">the</span> <span word="surface">surface</span> <span word="conditions">conditions</span>.</p><p><span word="Looking">Looking</span> <span word="for">for</span> <span word="the">the</span> <span word="best">best</span> <span word="match">match</span> <span word="between">between</span> <span word="shoe">shoe</span> <span word="and">and</span> <span word="surface">surface</span>, <span word="researchers">researchers</span> <span word="at">at</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Sheffield">Sheffield</span> <span word="have">have</span> <span word="built">built</span> <span word="a">a</span> <span word="special">special</span> <span word="mechanical">mechanical</span> <span word="rig">rig</span> <span word="that">that</span> <span word="can">can</span> <span word="measure">measure</span> <span word="the">the</span> <span word="shoe">shoe</span> <span word="traction">traction</span>.</p><p>"<span word="In">In</span> <span word="order">order</span> <span word="to">to</span> <span word="do">do</span> <span word="that">that</span>," <span word="said">said</span> <span word="Matt">Matt</span> <span word="Carre">Carre</span>, <span word="an">an</span> <span word="instructor">instructor</span> <span word="in">in</span> <span word="the">the</span> <span word="mechanical">mechanical</span> <span word="engineering">engineering</span> <span word="department">department</span>, "<span word="we">we</span> <span word="need">need</span> <span word="to">to</span> <span word="understand">understand</span> <span word="a">a</span> <span word="number">number</span> <span word="of">of</span> <span word="parameters">parameters</span>, <span word="including">including</span> <span word="how">how</span> <span word="the">the</span> <span word="shoe">shoe</span> <span word="changes">changes</span>, <span word="how">how</span> <span word="the">the</span> <span word="properties">properties</span> <span word="of">of</span> <span word="the">the</span> <span word="shoe">shoe</span> <span word="affect">affect</span> <span word="that">that</span> <span word="interaction">interaction</span>, <span word="how">how</span> <span word="the">the</span> <span word="properties">properties</span> <span word="of">of</span> <span word="the">the</span> <span word="tennis">tennis</span> <span word="courts">courts</span> <span word="affect">affect</span> <span word="that">that</span>, <span word="and">and</span> <span word="also">also</span> <span word="other">other</span> <span word="factors">factors</span> <span word="like">like</span> <span word="temperature">temperature</span>" <span word="and">and</span> <span word="how">how</span> <span word="the">the</span> <span word="players">players</span> <span word="slide">slide</span> <span word="or">or</span> <span word="move">move</span> <span word="around">around</span> <span word="the">the</span> <span word="court">court</span>.</p>
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