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高一讲摩擦力时,学生对物体的相对运动趋势难于理解,我用有机玻璃(木块也行)和一个较软的弹簧制成了物体的相对运动趋势演示仪,如图1所示。使用时,把物体的相对运动趋势演示仪放在小车上,当小车加速前进时,小球向后倾斜,如图2所示,当小车匀速前进时,小球、弹簧和小车在一条竖直线上,当小车减速前进时,小球向前倾斜,可非常直观的演示物体的相对运动趋势。若小车的加速度超过了某一极限值,演示仪可在小
When students talk about friction, the trend of students’ relative movement of objects is difficult to understand. I used the plexiglass (a block of wood also works) and a softer spring to create a demonstration device for the relative movement of objects, as shown in Figure 1. When using, put the object’s relative movement trend demonstrator on the car. When the car accelerates forward, the ball tilts backwards. As shown in Figure 2, when the car moves at a uniform speed, the ball, the spring and the car are in a vertical position. On the line, when the car decelerates and advances, the ball leans forward, which can be very intuitive to demonstrate the relative movement of objects. If the car’s acceleration exceeds a certain limit, the demonstrator can be small