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从基础概念间的直接联系分析一个复杂的物理问题,遇到困难时,可尝试转换思路,挖掘或探究与之有深层影响关系的其他间接概念,寻找或发现隐含的条件或特征,以体现概念间联系和制约的深层次上的物理实质。例一质量为m可视为质点的小球P,用长为L且不可伸长的轻质细绳系于竖直面上的O点。拉紧细绳使小球P与O点处于同一水平线上的A点处。由静止开始释放小球,球P从A位置开始沿圆弧形曲线运动到O点竖直下方的B点。如图1所示。若不计一切阻力和摩擦,求,
Analyze a complex physical problem from the direct connection between basic concepts. In case of difficulties, try to change ideas, explore or explore other indirect concepts that have a deep influence on it, and find or discover hidden conditions or features to reflect The deep physical substance of the connection and restriction between concepts. Example A mass m can be regarded as a particle P, with a length of L and inextensible light string tied to the point O on the vertical plane. Tighten the string so that the ball P and O point in the same horizontal line at the A point. The pellet is released from rest and the ball P moves along arc curve from point A to the point B vertically below O point. As shown in Figure 1. If you do not count all the resistance and friction, seeking,