如图所示,长木板固定于水平实验台上。放置在长木板处的小球(大小不计),在水平恒力的作用下向右运动,运动到长木板边缘处撤去水平恒力,小球水平抛出后恰好落在光滑斜面顶端

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◎ 题目

如图所示,长木板固定于水平实验台上。放置在长木板处的小球(大小不计),在水平恒力的作用下向右运动,运动到长木板边缘处撤去水平恒力,小球水平抛出后恰好落在光滑斜面顶端处,且速度方向平行于斜面。己知小球质量为,与水平长木板间的动摩擦因数为,长木板长为,距离水平地面的高度为,斜面倾角为两点间竖直高度为。求:
(1)的水平距离
(2)水平恒力的大小;
(3)小球落地时速度的小。

◎ 答案


(1)
(2)
(3)

◎ 解析

(1)小球落在处时,············································· 2分
·································································· 2分
小球从
···················································································· 2分
··················································· 2分
(2)小球从 
由动能定理得;
·········································································· 3分
······································································ 2分
(3)小球从到地,机械能守恒得:
······································································· 3分
······································································ 2分
(其他正确解法同样得分)

◎ 知识点

    专家分析,试题“如图所示,长木板固定于水平实验台上。放置在长木板处的小球(大小不计),在水平恒力的作用下向右运动,运动到长木板边缘处撤去水平恒力,小球水平抛出后恰好落在光滑斜面顶端…”主要考查了你对  【平抛运动】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。

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