<p class="ql-block"><b>2B Unint10 there is thunder-2</b></p><p class="ql-block">视频:清华英语，复述粉猪第一季《windy castle》</p><p class="ql-block">音频:清华英语，汉语第三册</p> <b>1. Static Electricity Experiments</b><br><br>Here are some experiments that allow the kids to learn about static electricity. This teaches kids about the positive and negative charges and where they come from.<br><br>(1) Sticking a balloon to a wall<br><br>* Materials:<br>• balloon<br>• a piece of wool, nylon or fur<br>• wall<br><br>* Process:<br>Blow up the balloon and tie it.<br>Rub the balloon with your piece of wool, nylon or fur quickly.<br>Put the balloon against the wall and let go.<br>Watch what happens. It should stick to the wall.<br><br>* Explanation:<br>Why does this happen? When you rub the balloon, you’re covering it with little negative charges. The negative charges are attracted to the positive charges that are in the wall. That’s why the balloon ‘sticks’ to the wall. 摩擦气球时，会在气球表面聚集负电荷。 当带有负电荷的气球靠近墙壁时，会被墙上的正电荷所吸引。<br><br><br> <b>2. Make your hair stand up</b><div><b><br></b>Materials: balloon<br>Process:<br>Blow up the balloon and tie it.<br>Rub it against your hair on top of your head.<br>Watch what happens! Your hair will stick up!<br><br>This also happens when you take off your wool hat in the wintertime. You usually notice static electricity in the winter when the air is very dry. During the summer, the air is more humid. The water in the air helps electrons move off you more quickly, so you can not build up as big of a charge. 在冬天脱下羊毛帽子时，也会发生这种情况。 通常会在冬天空气干燥的时候注意到静电。 在夏季不容易产生是因为空气更潮湿， 空气中的水有助于电子更快地离开，因此无法积聚很多电荷。<br>Explanation:<br>Why does this happen? It's because of static electricity! When you rub the balloon on your hair, you’re covering it with little negative charges. Now that each of the hairs has the same charge, they want to repel each other. In other words, the hairs try to get as far away from each other as possible.是因为静电！ 当在头发上摩擦气球时，头发上的负电荷全都转移到气球上面，使得每根头发都具有正电荷，因此它们会互相排斥。<br></div> <p class="ql-block">感觉长头发实验起来不是很明显，只能让娃感觉下😂！</p> <p class="ql-block"><b>3. lightning</b></p><p class="ql-block">I bought a lightning card for you. now let's play with the card. I am going to press this . And then you can see the lightning flashing in the air.</p><p class="ql-block">How can we make the lightning with this card?</p><p class="ql-block">Because Lightning is an electric current[ˈkʌrənt]电流，The wire and the card carry some electricity.</p><p class="ql-block">There are many ice crystals in a thundercloud. You are a ice crystal. And I am a ice crystal too.</p><p class="ql-block">the electricity produced in a cloud-only happens when the cold and hot winds blowing the clouds mix together. We bump into each other as we move around in the unstable air. All of those collisions 碰撞create an electric charge. I will give all my positive charges to you. And you will give me the negative charges.</p><p class="ql-block">After a while, the whole cloud fills up with electrical charges. The positive charges at the top of the cloud and the negative charges at the bottom of the cloud.</p><p class="ql-block">The negative charges on the bottom of the cloud go looking for the positive charges on the top of the cloud..</p><p class="ql-block">When they get together…Flash!</p> <p class="ql-block">电的实验必须留给专业人士（娃爸有电工证），感觉这个单元就是给娃爸准备滴，等他出来回来再搞！</p> <p class="ql-block"><b>4.Thunder</b></p><p class="ql-block">M:Thunder is something closely related to lightning. You’ll always hear thunder after you see lightning. Anyone know why?</p><p class="ql-block">Thunder is actually caused by the lightning. As the charge creates the lightning, it heats up the air around it. So when a bolt of lightning heats this air along its path, that air quickly expands膨胀. Thunder is the sound caused by that rapidly expanding air. If the charge is big, it creates a big…." “Big thunder!” “Right, it creates a big thunder clap. If it’s small, it creates..?” “A small clap?”</p><p class="ql-block">We probably wouldn’t even hear it. The bigger the charge and the closer it is, the bigger the sound.</p><p class="ql-block"><b>Make a thunder sound</b></p><p class="ql-block">Materials: trash bag</p><p class="ql-block"><b>Process:</b></p><p class="ql-block">Blow into the brown paper lunch bag and fill it up with air.</p><p class="ql-block">Twist the open end and close with your hand.</p><p class="ql-block">Quickly hit the bag with your free hand.</p><p class="ql-block"><br></p><p class="ql-block"><b>Explanation:</b></p><p class="ql-block"><br></p><p class="ql-block">Hitting the bag causes the air inside the bag to compress so quickly that the pressure breaks the bag. The air rushes out and pushes the air outside away from the bag. The air continues to move forward in a wave. When the moving air reaches your ear, you hear a sound. Thunder is produced in a similar way. As lightning strikes[straɪk] , energy is given off that heat the air through which it passes. This heated air quickly expands producing energetic waves of air resulting in a sound called thunder. 敲打袋子会使袋子内的空气压缩得如此之快，以至于压力使袋子破裂。 空气涌出并将空气向外推离袋子。 空气继续向前移动。 当移动的空气到达耳朵时，就可以听到声音。 雷电的产生方式与此类似。 雷击时，会释放出能量，从而加热空气穿过的空气。 加热的空气迅速膨胀，产生高能的空气波，从而产生雷声。</p> <b>5. Lightning and thunder</b><br><br>Light travels much faster than sound<br><br>Thunder and lightning start at the same time,but we will see the lightning first.<br><br>When a starting pistol [ˈpɪstl] is fired we see the smoke first and then hear the bang.<br><br>打雷和闪电同时开始，但我们先看到闪电。<br><br>当发令枪开火时，我们先看到烟雾，然后听到爆炸声。<br><br>Since light travels about five seconds per mile, you can count from the time you see the lightning to know its distance from you. <p class="ql-block"><b>指读第七周</b></p><p class="ql-block">指读时间30分钟，指读完可以自己分配时间看丫丫，还可以得到一个星星⭐️，累计星星得🎁，这个方法不错！</p> <p class="ql-block"><b>小趣事</b></p><p class="ql-block">上次把小丫头捣鼓的实验水倒了，特别伤心，还抱怨我！今天又捣鼓了一瓶神仙水，说要写个牌子，说不可以倒。真的是吃一堑，长一智！😜</p>