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人教版《物理·必修2》P_(21)介绍了“变速圆周运动和一般曲线运动”研究方法,以及“切向力”、“切向加速度”、“曲率半径”等概念.这部分“下放”的大学物理内容,不但开阔了中学教学视野,也指出了曲线运动深入学习的具体方向,引导我们驻足探究,拓展认知.兹举一例.例1如图1(a)所示,质量为m的小物体放在水平转台上,离转轴距离为r,与台面间的摩擦系数为μ,设重力加速度为g.现转台由静止开始加速启动,启动阶段可视为角速度随时间
People’s Education Edition “Physics Compulsory 2” P 21 introduced the research methods of “variable speed circular motion and general curve motion”, as well as “tangential force”, “tangential acceleration”, “radius of curvature This part of the ”decentralization" of the university physical content, not only broadened the horizons of secondary education, but also pointed out the specific direction of the curve movement in-depth study, guide us to stop exploring, to expand cognitive. As shown in Fig. 1 (a), a small object of mass m is placed on a horizontal turntable with a distance r from the axis of rotation and a coefficient of friction μ between the surface and gravitational acceleration g. The turntable starts accelerating from rest, The start-up phase can be considered as angular velocity over time