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一、(山口大学) 如图1所示,有光滑面ABC和光滑水平面DE。在水平面DE上有一质量为M的平台与水平面BC和垂直面CD相接触,把质量为m的小物体,放在高为h的A点,用手支持着。请回答下列两种情况的问题: 1.将平台固定在DE面上不让动,让小物体由A点以初速为O滑下,沿光滑面ABC运动,并换乘到平台上,在此台上物体便受到与运动方向相反的摩擦力
I. (Yamaguchi University) As shown in Figure 1, there is a smooth surface ABC and a smooth level DE. There is a platform with a mass M on the horizontal plane DE which is in contact with the horizontal plane BC and the vertical plane CD. The small object with the mass m is placed on the point A which is the height h and is supported by the hand. Please answer the following two questions: 1. Fix the platform on the DE surface so that the small object slides from point A to O at the muzzle velocity, moves along the smooth surface ABC, and transfers to the platform. Objects on the stage are subject to friction opposite to the direction of motion