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
| 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。 |
赞 cyfcom 幼苗
共回答了13个问题采纳率：92.3% 举报
（1）
（2）
（3）
（1）小球落在
处时，
············································· 2分
·································································· 2分
小球从
到
···················································································· 2分
··················································· 2分
（2）小球从
到
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）
（2）
（3）
（1）小球落在
处时，
············································· 2分
·································································· 2分小球从
到 
···················································································· 2分 ··················································· 2分（2）小球从
到 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）
1年前
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