体育运动中“镁粉”的物理作用

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13、arChar1FONT-FAMILY: CalibriDIV.MyFav_1244079203518 SPAN.CharCharFONT-FAMILY: CalibriDIV.MyFav_1244079203518 DIV.Section1page: Section1在双杠、举重、吊环等一些体育比赛中，运发动在正式比赛前都会很认真地在双手和器材上涂抹上一层白色的粉末，这是在做什么？通常，运发动在比赛时，手掌心常会冒汗，这对运发动来说非常不利。因为湿滑的掌心会使摩擦力减小，使得运发动握不住器械，不仅影响动作的质量，严重时还会使运发动从器械上跌落下来，造成失误，甚至受伤。为此，运发动要涂擦一种俗称“镁粉的专用防滑粉，其成分为碳酸镁MgCO2，无毒、无味，在空气