物体滑过两平面衔接处的能量损失分析及反思

• 作 者: 沈志强
• 机 构: 江苏省常熟市王淦昌中学,
• 出 处: 考试与评价
• 发表日期: 2017年03期
• 关键词: 中学物理 小圆弧 动摩擦因数 向心加速度 能量损失 方向变化 动能定理 竖直方向 高中物理 物理过程

中学物理中一些非常典型的问题,在模型的选择、题目的设计、过程的分析与处理等方面上是很值得的商榷的,而且至今也没有引起广大中学物理教师的关注。1.通过小圆弧就能解决因碰撞损失的机械能吗?在中学物理中,经常遇到物体从一个平面滑到另一个平面上而设计的习题,这是一类很典型的习题,例如:例1.如图(1)所示,ABCD是一条长轨道,其中AB段是倾角为θ的斜面,CD段是水平的,BC是与AB和CD都相切的一小

Some very typical problems in middle school physics are worth discussing in the aspects of model selection, topic design, process analysis and processing, and so far they have not attracted the attention of the majority of middle school physics teachers. 1. Can you solve the mechanical energy loss due to collision through a small arc? In high school physics, you often encounter the problem that objects are designed to slide from one plane to another plane. This is a very typical problem. For example: Example 1. As shown in Figure 1, ABCD is a long track, where AB is a bevel with an inclination of θ, CD is horizontal and BC is a small tangent to AB and CD