物理實(shí)驗(yàn)怎么考?這是alevel物理補(bǔ)習(xí)到最后所有學(xué)生都被困擾到的問(wèn)題，實(shí)驗(yàn)操作是獲得準(zhǔn)確數(shù)據(jù)的基礎(chǔ)，也是讓整個(gè)實(shí)驗(yàn)不出錯(cuò)誤的保障，今天留學(xué)生輔導(dǎo)老師給大家說(shuō)下AS實(shí)驗(yàn)paper3答題技巧有哪些？今天我們選擇的CIE官方考試局的alevel物理補(bǔ)習(xí)指導(dǎo)。

實(shí)驗(yàn)操作是獲得準(zhǔn)確數(shù)據(jù)的基礎(chǔ)，也是讓整個(gè)實(shí)驗(yàn)不出錯(cuò)誤的保障。而將操作規(guī)范放一邊不談，我們今天就談?wù)勧槍?duì)實(shí)驗(yàn)卷paper3的第一個(gè)題型，我們?cè)撊绾巫鞔?，如何表述自己的?shù)據(jù)才能讓自己盡量多的拿到最后的分?jǐn)?shù)。

p3的第一題具有固定的實(shí)驗(yàn)思路，當(dāng)然也有統(tǒng)一標(biāo)準(zhǔn)的答題模式，按照題目的思路，

首先應(yīng)該是用某一種測(cè)量?jī)x器測(cè)量，記錄第一組數(shù)據(jù)，請(qǐng)你注意，在寫下第一個(gè)數(shù)據(jù)的同時(shí)，也向閱卷人宣告了自己所用儀器的誤差或精確度，在之后的所有對(duì)相同物理量的測(cè)量時(shí)，精確度必須保持一致。

寫完第一組數(shù)據(jù)后，接下來(lái)就是改變自變量，分別得到六組因變量數(shù)據(jù)，然后做表格，

畫圖(90%+是直線)，求斜率，求截距，給定方程求常量，大致也就這幾個(gè)步驟了。

接下來(lái)，留學(xué)生輔導(dǎo)老師帶大家一起來(lái)解析CIE官方給出的學(xué)習(xí)指導(dǎo)：

paper 3 Tips: practical Test

Do not panic if the context of the practical experiment appears unfamiliar. Where appropriate the question paper will tell you exactly what to do and how to do it.

(按照試卷的要求進(jìn)行傻瓜操作就可以了，不用多想)

If you find yourself in real difficulty setting up your practical equipment you may ask your supervisor for help,you will only lose one or more marks for this.

(請(qǐng)老師幫忙也要付出代價(jià)的哦，但如果你真的不會(huì)連或者找不到電路中的錯(cuò)誤又能纏著老師幫你到底的話，幾分也是值得的吧)

There are a number of things that you can do to save time: Draw a single table for your results in advance of taking any readings and enter your readings in the table as you take them (so that you do not waste time having to copy them up later).

(先思考需要記錄的物理量，共有多少個(gè)?分別是什么?表格應(yīng)該有幾行幾列?)

This is also important because you must record all your raw readings before you calculate and record any average readings.

(真很簡(jiǎn)單吧?不解釋)

If the number of readings that you need to take is indicated in the question paper do not waste time by exceeding this number. Repeat your readings,but remember that it is only necessary to repeat them once (so that you have two sets of values) - do not waste time repeating them more than once.

All the raw readings(記得是測(cè)量數(shù)據(jù)哦，可不是計(jì)算得值哦!) of a particular quantity should be recorded to the same number of decimal places which should in turn be consistent with the uncertainty in the readings.

(一句話，同一個(gè)物理量測(cè)六次，精確度必須相同，不解釋!)

The uncertainty in a measurement can sometimes be larger than the smallest interval that can be measured by the measuring equipment. For example,a stopwatch can measure time to a hundredth of a second,but human reaction times will mean that the uncertainty in the reading given by a stopwatch is (typically) 0.1s to 0.4s.

(建議各位把各種測(cè)量?jī)x器的使用方法及誤差在考前做一個(gè)總結(jié)，事半功倍!)

Each column heading in your table must contain both a quantity and its unit. For instance if you have measured time “t” in seconds,your column heading would be written as “t/s” (“t in s” or “t(s)” would also be acceptable). The quantity or unit or both may also be written in words rather than symbols. (這就是傳說(shuō)中的表頭了，這可是閱卷人評(píng)閱表格的第一項(xiàng)，第一印象的重要性就不要我重復(fù)了吧。)

The number of significant figures used in a derived quantity that you calculate from your raw readings should be equal in number to (or possibly one more than) the number of significant figures in the raw readings.

(這個(gè)沒(méi)有理由，convention，就和丈夫不能出軌一樣的道理，出軌了后果自負(fù)吧!)

For example,if you measure potential difference and current to 2 and 3 sig figs respectively,then the corresponding value of resistance calculated from them should be given to 2 or 3 sig figs,but not 1 or 4. If both were measured to 3 significant figures,then the resistance could be given to 3 (or 4) sig figs. (從這里也可以看出，同一豎向列里的數(shù)據(jù)，有可能小數(shù)點(diǎn)后的位數(shù)會(huì)不同，但并不影響結(jié)果。)

When drawing your graph,do not forget to label each axis with the appropriate quantity and unit,(和表頭一樣重要，您自己掂量，是不是應(yīng)該在選取分度值之前先把他們給標(biāo)上呢?)

using the same format for expressing column headings in a table. Choose a scale such that the plotted points occupy at least half the graph grid in both the x and y directions.(此處有技巧，減減除除約約，完事!)

The x-axis scale should increase positively to the right and the y-axis scale should increase positively upwards. Use a convenient scale such as 1,2 or 5 units to a 50px square (建議您就用這個(gè)吧，別弄個(gè)3,4,6的，搬了石頭砸自己的腳，好疼的!)

as you will then be less likely to make a mistake with the position of your plotted points and it will be easier for you to read off points from your graph if you are calculating the gradient or finding an intercept. Similarly,it is good practice to mark values on at least every other 50px square.

All your plotted points should be on the grid; points in the white margin area will be ignored. plot all your observations and ensure that they are accurate to half a small square. A fine cross (or an encircled dot) drawn with a sharp pencil is acceptable,but be careful not to obscure the position of your points by your line of best fit or other working.

(鉛筆削細(xì)，描點(diǎn)畫叉，做線細(xì)又直，千萬(wàn)別把點(diǎn)給蓋了!)

When drawing your line of best fit,ensure you have an even balance of points about the line along its whole length. If it is a straight line,use a clear plastic rule so that you can see points on both sides of the line as it is being drawn.

(盡量多的過(guò)點(diǎn)，不在線上的點(diǎn)均勻分布在直線兩側(cè))

Show all your working when calculating a gradient. It is helpful to draw the triangle(做好虛線的直角三角形哦) used to calculate the gradient on the graph and to clearly label the coordinates of the vertices(標(biāo)好您所選擇的用來(lái)計(jì)算斜率的兩個(gè)點(diǎn)的坐標(biāo)) (accurate to half a small square). These values can then be used in the gradient calculation. The length of the hypotenuse of the triangle should be greater than half the length of the graph line.

(選點(diǎn)選兩頭，不要選表格中的點(diǎn)，以免引起誤會(huì)解釋不清)

If you are required to give a value for the y-intercept,it may be possible to directly read it off from your graph(如果直線與y軸有交點(diǎn)，太好了，直接讀取) from an axis where x=0. If this is not possible you can instead calculate the y-intercept by using the equation of a straight line.

(如果沒(méi)有與y軸相交，那就把算斜率的點(diǎn)帶進(jìn)直線方程去求吧)

In this case you should substitute into this equation a pair of x and y values from your line of best fit along with your calculated value of gradient.

以上便是國(guó)際課程輔導(dǎo)alevel物理答題技巧輔導(dǎo)，有很多學(xué)生在考試前好幾個(gè)月就對(duì)alevel物理進(jìn)行了各種準(zhǔn)備。有計(jì)劃的準(zhǔn)備對(duì)于考試來(lái)說(shuō)是非常有必要的。對(duì)待基礎(chǔ)知識(shí)也要踏踏實(shí)實(shí)的學(xué)習(xí)，不能掉以輕心。alevel物理補(bǔ)習(xí)的考試基本題型要多刷，不能怕麻煩，沒(méi)有耐心。