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塑料瓶是生活中随手可得的物品,常当垃圾处理。利用简易构造原理,可利用塑料瓶来演示下面两则实验。一是演示反冲运动;二是演示静电除尘原理。一、演示反冲运动原理:根据动量守恒定律,如果一个静止的物体在内力的作用下分裂成两个部分,一部分向某个方向运动,另一部分必然向相反的方向运动。器材:塑料瓶一个、卫生纸一张、中性笔笔芯2支、橡皮塞1个、食醋(CH_3COOH)、小苏打(N_aHCO_3)等。方法:如图1所示,向空塑料瓶里倒适量食醋,
Plastic bottles are readily available items in life, often as garbage disposal. Using the simple construction principle, plastic bottles can be used to demonstrate the following two experiments. First, demonstrate the recoil movement; second is to demonstrate the principle of electrostatic dust. First, demonstrate the principle of recoil movement: According to the law of conservation of momentum, if a static object under the action of internal forces split into two parts, one part to a certain direction, the other part is bound to the opposite direction of movement. Equipment: a plastic bottle, toilet paper, gel pen 2, a rubber stopper, vinegar (CH_3COOH), baking soda (N_aHCO_3) and so on. Method: As shown in Figure 1, pour the appropriate amount of vinegar into empty plastic bottles,