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初中物理机械能部分讲到,物体发生弹性形变时具有势能,它与动能可以相互转化,并可做功。因是本节的重点,又是教材的难点,学生不易理解。为此,我设计、自制了机械能“自动车”。 一.材料 1.木芯一个(用完棉线的木轮)。 2.曲别针、直别针各两个。 3.橡皮筋、废油笔芯、小塑瓶(装眼药水的废瓶)各一个。 4.蜡烛一段(60～70mm)。
The part of junior high school physics mechanical energy mentioned that when the object is elastically deformed, it has potential energy, and it and kinetic energy can be transformed into each other and work can be done. Because it is the focus of this section and the difficulty of the teaching materials, students are not easy to understand. For this reason, I designed and made a mechanical energy “automobile.” 1. Materials 1. One wooden core (wooden wheel used up with cotton thread). 2. Two clips and straight pins. 3. Rubber band, waste oil refill, small plastic bottle (waste bottle of eye drops) one each. 4. A section of candle (60-70mm).