KS2科学 植物 影子 磁铁 声音 电路 化石
KS2 的科学课在文件里只有薄薄十几页，落到家里却是一堆具体问题：种子为什么朝着窗长，影子为什么一下午会长出一截，灯泡为什么不亮。英国国家课程的科学学习计划（gov.uk 官网，文件编号 DFE-00182-2013，2013 年发布，2015 年 5 月更新三年级光的部分，2016 年 9 月起对 1 到 10 年级生效）把三四年级和五六年级的内容按年分组，同时写明 working scientifically 必须挂在知识点上教，不能单独拎出来上一节课。所以实验不是加餐，它本身就是课堂和评估的载体。下面十二个实验都能用厨房和文具店的材料做完，每个对应一条具体考点，做完能说出结论、能画表格、能接住追问。
The KS2 science programmes of study run to a few dozen pages, and they turn into very specific questions at the kitchen table: why seedlings lean towards the window, why a shadow gets longer through the afternoon, why the bulb stays dark. The DfE programmes of study for key stages 1 and 2 (DFE-00182-2013, published 2013, updated in May 2015, in force from September 2016 for years 1 to 10) set content out year by year and insist that working scientifically is taught through that content rather than as a separate lesson. Practical work is part of the syllabus, not an extra. Each of the twelve investigations below uses kitchen or stationery materials and targets one named objective that children should be able to describe, tabulate and explain, and the recording habit matters as much as the result.
三年级植物 种子发芽的对照实验
三年级植物要求观察种子和鳞茎怎样长成成熟植株，并找出植物需要水、光和合适温度才能健康生长。这个实验不用土：两个一样的透明杯子，各垫一张湿厨房纸，各放三颗绿豆，一杯放窗边，另一杯同样湿润但塞进鞋盒。每天同一时间量一次芽的长度，读数记到毫米，写进三列表格。常见的错误是两个变量一起改，位置换了水量也不同，最后两杯的高低差说明不了任何问题。等数据出来，让孩子自己说出哪一杯长得快、凭什么判断，比背一句结论有用。很多学生以为种子发芽必须有光，实际上发芽阶段靠的是种子自带的养分，真正离不开光的是出芽之后的生长。
Year 3 pupils observe how seeds and bulbs grow into mature plants and find out what plants need to stay healthy. Two identical clear cups, wet kitchen paper and three mung beans in each will do, with one cup on a bright windowsill and the other sealed inside a shoe box. Measure the shoot daily at the same time and record millimetres against the day in a three-column table; change one variable only, because a cup that moves and also gets different water tells you nothing at all. Children often assume germination needs light, whereas the seed's own food store does most of the work and light matters mainly once the shoot appears.
三年级光与影子 手电筒读数与遮挡
三年级光的内容从影子开始：光被挡住时形成影子，影子会随光源的位置改变。把一支铅笔用橡皮泥立在桌上，手电筒固定在同一高度，分别放在 10 厘米、20 厘米、30 厘米处，每次量影子长度并记录。光源越近影子越大的规律，孩子自己做三次就能看出来。最容易出问题的地方是手电筒斜着照却不记角度，长度和方向一起变化，读数就没有可比性。国家课程原文里有一条安全提醒，不要直视太阳，戴墨镜也不行，所以这个实验留在室内做。做完可以问一句傍晚的影子为什么比中午长，这个问题把实验和地球自转提前接了起来。
Year 3 light starts with shadows: they form when light is blocked, and they change with the position of the source. Stand a pencil in modelling clay, hold a torch at the same height at 10 cm, 20 cm and 30 cm, and measure the shadow each time. Three readings are enough for children to see that a closer torch makes a longer shadow; keep the torch angle fixed, since a tilted torch changes both length and direction and the numbers stop being comparable. The programme of study carries a safety note about never looking directly at the Sun, even through dark glasses, so this stays indoors; asking why the evening shadow is longer than the midday one links the investigation forward to the rotation of the Earth.
三年级力与磁铁 隔纸吸引与材料分组
三年级力与磁铁要求比较磁铁能否隔着材料吸住物体，再按是否被吸引把材料分组。冰箱贴磁铁、回形针和一叠便签纸就够，从一张纸加到十张，记录回形针在第几张时掉下来。换成铝箔、塑料卡和木尺各试一遍，孩子通常会自己得出铁和钢有反应、铝和塑料没有反应。英国硬币在这里是个陷阱，现在流通的硬币多为钢芯镀镍，磁铁吸得住，换成旧的一分两分铜币却吸不住，一混就把规律记反了。结论要写成一个数，比如能吸住的最多纸张数，而不是写磁铁很强。按材料分组时，判断依据讲清楚，孩子才知道自己在比什么。
Year 3 forces and magnets compare whether magnets attract objects through different materials, then group materials by whether they respond. A fridge magnet, a paper clip and a stack of sticky notes will do: add one sheet at a time up to ten and note when the clip drops. Repeat with foil, a plastic card and a wooden ruler, and most children conclude for themselves that iron and steel respond while aluminium and plastic do not. British coins are a trap, because most current coins have a steel core and stick while older copper coins do not; write the conclusion as a number of sheets rather than a word like strong, and state the grouping criterion so children know what they are comparing.
三年级岩石 硬度划痕与渗水计时
三年级岩石要求比较不同岩石的硬度和渗水性，并知道化石是岩石里保存下来的过去生物的痕迹。园艺店按袋卖的花岗岩、石灰石和板岩各取一小块，先用铜板划一次、再用铁钉划一次，看有没有留下划痕，然后各滴五滴水，计时看多久被吸收。硬度顺序和渗水性顺序不一定一致，这正是把两项分开记录的理由。很多学生以为水滴得快的石头一定软，其实孔隙多只说明吸水快，硬度要看划痕深浅。做完找一张化石图片，问它为什么出现在沉积岩里，这一问已经把六年级的进化内容提前铺好。三种石头的对比表比任何定义都好用。
Year 3 rocks compares hardness and permeability and introduces fossils as evidence of living things preserved in rock. Buy a small granite, limestone and slate sample, scratch each with a copper coin and then an iron nail, and place five drops of water on each to time absorption. Hardness order and permeability order need not match, which is why they get separate rows in the table; permeable is not soft: a porous rock can drink water quickly and still resist a scratch. A fossil photograph and the question of why it sits in sedimentary rock links the topic towards evolution in Year 6, and the comparison table does more work than any definition.
四年级物质状态 结冰曲线与融化计时
四年级物质状态要求把物质分为固体、液体和气体，并观察加热与冷却时的状态变化。半杯水放进冷冻室，每小时看一次，记录开始结冰与完全结冰的时刻；再把冰块放在碟子里，每五分钟记录一次融化程度。温度计要插在冰水混合物里，不要悬在空气上方，否则读数滞后。常见的错误是把白雾当成水蒸气，看得见的白雾是小水滴，真正的水蒸气无色透明，这一点在四年级写错，到 GCSE 讲潜热时还会再错一次。把数据画成温度随时间变化的曲线，结冰平台那一段最值得讨论，温度不变的时候状态仍在改变。曲线画完，固体液体的区别就不用再背了。
Year 4 states of matter groups materials as solids, liquids or gases and looks at changes of state on heating and cooling. Half a cup of water in the freezer, checked hourly, gives a freezing curve, and ice cubes on a plate checked every five minutes give a melting curve. Keep the thermometer in the ice and water mixture rather than in the air above it, or the readings lag behind; the visible mist above a kettle is tiny droplets, not water vapour, and that mix-up tends to survive until latent heat at GCSE. Plot temperature against time and the flat section during freezing becomes the most interesting part, since temperature holds steady while the state keeps changing.
四年级声音 橡皮筋振动与水量音阶
四年级声音要求找出声音由振动产生、音高随振动快慢变化、音量随振动幅度变化。三根粗细不同的橡皮筋绷在同一个小盒上，依次拨动，比一比振动的快慢；再用尺子轻拨与重拨同一根，比较响度差别。更好操作的版本是四个一样的玻璃杯装不同高度的水，用勺背敲击，敲出音阶后让孩子把杯子按音高排队。这里最常见的错误是把敲得重和音调高混为一谈，重敲只改变响度，改变音高要靠水的多少。做完让孩子用手按住杯口，感受振动停止的那一刻声音同时消失，这个动作比讲十遍振动更直接。音高与响度两个词要从头到尾用同一个说法。
Year 4 sound links vibration to pitch and amplitude to volume. Three rubber bands of different thickness stretched across a small box, plucked in turn, show how the rate of vibration changes the note, while a gentle and a firm pluck of one band show the change in loudness. Four identical glasses filled to different heights and tapped with the back of a spoon give a scale children can order by ear. A harder hit raises volume only, and confusing that with a higher note is the usual slip; touch the rim to feel the vibration stop exactly when the sound stops, which convinces far more than an explanation.
四年级电学 一节电池的串联电路
四年级电学要求搭建简单串联电路，并识别常见的导体与绝缘体。一节 1.5 伏电池、一个灯泡座、两个鳄鱼夹和一段导线就够，先让灯泡亮起来，再把铅笔芯、硬币、橡皮和塑料尺依次接进电路的缺口。最常见的问题是鳄鱼夹咬在绝缘皮上，或者两根夹子隔着桌子没有真正接触，灯泡不亮，孩子就以为材料不导电。四年级只要求串联电路，并联要等到六年级，不必提前讲电流分流。安全上说明一句：全程用 1.5 伏干电池，家里的插座不要碰。灯泡亮与不亮这一条结论，要用电路是否闭合来解释，而不要只说材料好坏。
Year 4 electricity covers building simple series circuits and testing materials as conductors or insulators. One 1.5 V cell, a bulb holder, two crocodile clips and a length of wire are enough: light the bulb first, then bridge the gap with a pencil lead, a coin, a rubber and a plastic ruler in turn. Most failures come from a clip biting the insulation instead of the metal, or from clips that never touch, and the child then concludes that the material blocks current. Series circuits only are required at Year 4, with parallel circuits waiting until Year 6; explain a dark bulb by whether the circuit is closed rather than by calling a material bad, and keep everything on 1.5 V cells away from mains sockets.
四年级栖息地 阳台样方与食物链箭头
四年级生物栖息地要求把生物按可观察特征分组，并用简单的食物链说明动物从哪里获得食物。在阳台或小区草地用一根绳围出 50 厘米见方的样方，十分钟内记录看到的昆虫种类和数量，再换一个阴凉处重复一次。两组数据放进同一张表，孩子会看到光照和湿度不同的地方种类差别很大，这个差别往往超出预期。常见的错误是把蜗牛和蚯蚓都算成昆虫，判断依据要落到腿的数量和身体是否分节。画食物链时箭头表示能量流动的方向，写反了在中学还会继续错。微栖息地这个词值得单独讲，砖缝和落叶堆下的种类完全不同。
Year 4 living things and their habitats asks pupils to group living things by observable features and to describe a simple food chain. A string square of 50 cm on a balcony or a patch of grass, with ten minutes of recording, gives a species count that can be compared with a shaded patch nearby. Differences in light and moisture change the count more than children expect, which is why two squares beat one. Snails and earthworms are not insects, and the test is leg count and body segments; arrows in a food chain show the direction of energy flow, and reversing them is a mistake that often survives into secondary school.
五年级地球与太空 日晷影子弧线
五年级地球与太空要求描述地球与太阳、月球的相对运动，并用它解释昼夜。最简单的做法是在院子里立一根木棍，每小时在同一张纸上记下影子顶端的位置和长度，从上午九点记到下午三点，六个点连起来就是一条弧线。影子最短的时刻接近正午，却常常不在十二点整，因为英国使用夏令时，这个差别正好用来说明地方时与时区。最常见的错误是把昼夜解释成地球绕太阳转一圈，昼夜来自地球自转，一年才来自公转。做完再问夏天影子为什么短，四季的倾角解释就能自然接上。木棍换成孩子自己的身高也可以，数据更有参与感。
Year 5 Earth and space describes the relative motion of Earth, Sun and Moon and uses it to explain day and night. A stick in the ground and a sheet of paper marked hourly from nine until three give six shadow tips that form an arc. The shortest shadow falls near midday but rarely at exactly twelve, because of British Summer Time, and that gap is a useful way into local time and time zones. Day and night come from rotation rather than from the orbit, and mixing the two is the usual slip at this age; asking why summer shadows are shorter opens the tilt explanation, and measuring a child's own shadow instead of a stick keeps the interest up.
五年级材料 溶解 过滤与可逆变化
五年级材料性质与变化要求区分溶解、混合与化学反应，并判断哪些变化可以逆转。四杯等量温水，分别加一勺盐、糖、面粉和沙子，搅拌后静置，先看杯底有没有残留，再用滤纸过滤，看滤液是否澄清。盐和糖完全消失，面粉让水变浑，沙子沉底，这组对照比单独讲定义有效。常见的错误是把溶解当成消失，孩子说不出盐去了哪里，可以让他把盐水放在窗边几天，水分蒸发后盐会重新出现。另一个判断标准是能否恢复原状，融化的冰可以再冻回冰，烤过的蛋糕不能。可逆与不可逆这一对概念，用这两句话就落地了。
Year 5 properties and changes of materials separates dissolving from mixing and from chemical change, and asks whether a change can be reversed. Four cups of warm water with salt, sugar, flour and sand show the difference in one lesson: the first two disappear, flour clouds the water, sand settles, and filter paper then separates only some of them. Calling dissolving disappearance leaves children unable to say where the salt went, so leave the salt solution on a windowsill until the crystals return. Reversibility gives a second test, since melted ice refreezes while a baked cake does not; two sentences cover the reversible and irreversible pair.
六年级光 直线传播与小孔成像
六年级光要求用光沿直线传播解释物体为什么能被看见，以及影子为什么与物体形状相同。三张带孔的卡片排在一条直线上，手电筒从一端照，只有三个孔对齐时光才能穿过，稍微错开一格光就断了。接着做鞋盒小孔成像，把手机手电筒放在盒外，盒内贴一张半透明纸，纸上会出现倒立的像，这与光走直线完全一致。常见的错误是认为像应当正立，孩子看到倒像时往往先怀疑装置做错了。国家课程在六年级还要求用同一原理设计一个潜望镜，两面镜子各成 45 度，光走成 Z 字形。动手做完，直线传播这四个字就不用再解释。
Year 6 light explains that objects are seen because light travels in straight lines to the eye, and that shadows share the shape of the objects casting them. Three cards with holes in a line, lit from one end, transmit light only while the holes align, and a one centimetre shift stops the beam. A shoebox with a pinhole and tracing paper produces an inverted image, exactly as straight-line travel predicts. Children expect the image to be upright and blame the equipment when it is not; the programme of study also asks for a periscope with two mirrors at 45 degrees, and building it settles the geometry faster than any diagram.
六年级进化与遗传 化石对比与适应
六年级进化与遗传要求说明生物会随时间变化，化石是过去生物的痕迹，后代与亲代相似但不完全相同，适应可以导致进化。找一组狗的照片，按耳朵形状、口鼻长度和体型排一排，让孩子指出哪些特征像亲代、哪些不一样。再把一张菊石化石图片与一张现生鹦鹉螺照片放在一起，问两者为什么相似又不相同。常见的错误是把适应说成动物想变就能变，适应是许多代里活下来并繁殖的那部分个体的特征被留下来，与个体努力无关。国家课程在这一节明确写明不需要讲基因与染色体，讲清选择过程就够。记录时用三列表格，变量、读数和单位，单位漏写在 KS2 是最常见的丢分点。
Year 6 evolution and inheritance covers change over time, fossils as evidence, offspring that resemble but do not copy their parents, and adaptation leading to evolution. A set of dog photographs sorted by ear shape, muzzle length and build shows inherited variation inside one species, and a Jurassic ammonite beside a living nautilus raises the same question about similarity and difference. Adaptation is not an animal deciding to change, but the survival and reproduction of individuals whose inherited features happen to suit the environment. The programmes of study state that genes and chromosomes are not required at this stage, so the selection story is enough; record everything in three columns of variable, reading and unit, since a missing unit is the most common loss at KS2.
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