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实验装置如右图所示,通过P、Q两颗螺钉将底板调整水平后,将铁球M从斜槽轨道A的某一高度h自由释放,铁球到达底部后,沿半径为r的圆弧形轨道B作匀速圆周运动,当铁球滚到另一小段与轨道B既保持
The experimental device is shown in the right figure. After the bottom plate is adjusted horizontally by two screws P and Q, the iron ball M is released from a certain height h of the chute track A. After the iron ball reaches the bottom, it follows a circle of radius r. The curved track B makes a uniform circular motion, keeping the iron ball rolling to another small section and the track B