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【简答题】
探究滑动摩擦力的大小与哪些因素有关的活动? (1)如下图所示,在水平桌面上,用弹簧测力计水平向左拉动木块,使其做( )运动,弹簧测力计次数渐放大图木块所受的滑动摩擦力为( )N, (2)将木块沿竖直方向截去一半后,测得木块所受的滑动摩擦力变为原来一半,他由此得出:滑动摩擦力的大小随接触面积的减小而减小,你认为他的探究过程中存在的问题是( )
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【简答题】697÷（142×3-385）
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