问题
填空题
如图所示，人在一般情况下步行前进时，若鞋底与地面没有打滑，地面对鞋底的摩擦力方向是向_______（填“前”或“后”）的。仔细观察发现鞋底的表面制成凹凸不平的花纹，这是采用_______的方法来增大摩擦的。
答案
前；增大接触面的粗糙程度
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如图所示，人在一般情况下步行前进时，若鞋底与地面没有打滑，地面对鞋底的摩擦力方向是向_______（填“前”或“后”）的。仔细观察发现鞋底的表面制成凹凸不平的花纹，这是采用_______的方法来增大摩擦的。
前；增大接触面的粗糙程度
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