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摩擦力和圆周运动是高中物理重要的知识内容,将两者结合在一起复习有利于学生更好地理解概念,内化解决问题的方法.例1如图1所示,一个质量为m的小物块相对静止于水平转台上,已知转台绕轴OO’匀速转动,角速度为ω,小物块到轴心的距离为r.试求:(1)小物块与转台间的摩擦力大小,小物块相对圆盘的运动趋势向哪?(2)如果转台转动的转速是逐渐增大的,在小物块发生相对滑动前,请在图2的俯视图中大致的画出.(3)如果
Friction and circular motions are high school physics-important contents of knowledge, combining them to review ways in which students can better understand concepts and internalize problems. Example 1 As shown in Figure 1, a small object of mass m The block is relatively stationary on the horizontal turntable, the turntable is known to rotate at a constant speed around the axis OO ’, the angular velocity is ω, and the distance from the small mass to the axial center is r.Requirements: (1) The friction between the small mass and the turntable, (2) If the rotating speed of the turntable is gradually increased, please sketch it in the top view of Figure 2 before the relative sliding of the small objects occurs. (3) If