推荐回答(3个)
1.为什么苹果熟了会往下掉? 万有引力
2.为什么恶劣天气出现往往夹杂着狂风? 冷热空气的强对流
3.为什么会先看到闪电,后听到雷声? 声速小于光速
4.为什么秤砣虽小可以压起千斤? 杠杆原理
5.为什么瓶盖拧不开时会垫条毛巾? 增大摩擦力
6.为什么用标枪扎鱼时,要往鱼下面扎? 光的折射作用
7.为什么穿上棉服可以保暖? 不流动的空气保温能力较强
8.为什么吹一吹热汤就可以降温? 蒸发带走大量的热
9.什么要把太阳能热水器的管弄成黑色? 黑色吸收光能效率高于白色
10.为什么用车辆运输会比拖动货物省力? 相同的介质表面,滚动摩擦小于滑动摩擦
1. 为什么用高压锅煮食物快?
2. 急刹车时为什么人会前倾?
3. 书包带为什么越宽背起来越舒服?
4. 水为什么往低处流?
5. 雨后为什么会出现彩虹?
6. 两个人之间在宇宙飞船上为什么不能直接对话?
7. 为什么有的电器用三孔插座,有的用两孔插座?
8. 日食月食怎么形成?
9. 乒乓球的上旋球怎么形成的?
10. 吸盘式挂衣钩的工作原理是?
水蒸汽、彩虹、水结冰、回声、船在水上行驶、飞机为什么会飞、放大镜、鼓掌为什么有声音、苹果为什么会掉下来、
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