AS物理Paper3怎么答 直接让考试局来教你

AS物理PAPER3的实验思路和答题模式相对比较固定，因此是比较容易通过训练复习的。所以今天我们给大家分享一下来自CIE考试局官方的AS物理PAPER3答题建议，看看怎么表述数据才能更接近评分标准。

AS物理Paper3 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. (按照试卷的要求进行作答就可以了，不要自己想太多)

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.（请导师帮忙也要付出代价的，但如果你真的不会连或者找不到电路中的错误又能缠着导师帮你到底的话，几分也是值得的吧）

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).（拿到题先思考需要记录的物理量，共有多少个？分别是什么？表格应该有几行几列？）

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

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（记得是测量数据哦，可不是计算的值） 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.（一句话，同一个物理量测六次，度记得必须相同。）

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. （建议各位把各种测量仪器的使用方法及误差在上考场前做一个总结，考试时候才能得心应手）

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. （这就是传说中的表头了，这可是阅卷人评阅表格的第一项，印象的重要性大家都懂）

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. （这个没有理由，convention，就和不能违法乱纪一样，不然后果自负吧）

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. （从这里也可以看出，同一竖向列里的数据，有可能小数点后的位数会不同，但并不影响结果。）

When drawing your graph, do not forget to label each axis with the appropriate quantity and unit,（和表头一样重要，是不是应该在选取分度值之前先把它们给标记上呢？） 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.（此处有技巧，减减除除约约！） 

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 （建议就用这个，别弄个3,4,6的，给自己制造障碍）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. （铅笔削细，描点画叉，做线细又直，注意千万别把点给盖掉了。）

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. （尽量多的过点，不在线上的点均匀分布在直线两侧）

Show all your working when calculating a gradient. It is helpful to draw the triangle（做好虚线的直角三角形哦） used to calculate the gradient on the graph and to clearly label the coordinates of the vertices（标好您所选择的用来计算斜率的两个点的坐标） (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. （选点选两头，不要挑表格中的点，以免引起误会解释不清）

If you are required to give a value for the y-intercept, it may be possible to directly read it off from your graph（如果直线与y轴有交点，那太方便了了，直接读取） 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. （如果没有与y轴相交，那就把算斜率的点带进直线方程去求吧）

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.

来自CIE官方的AS物理PAPER3答题建议分享就到这里，要照顾的小细节还是挺多的，比如对相同物理量的测量的度必须保持一致等等。大家一定要在平时练习的时候养成注意细节的习惯，实战时才能发挥稳定。

对于大多数同学来说，AS成绩是申请大学时学习能看到你已经考出的标化成绩，所以一定一定要认真对待，优势国际课程尽量冲A*，短板国际课程不要拖后腿。离明年大考一年比一年近了，如果你还没有找到适合自己的复习方法，点击预约试听【ALEVEL同步培训班】——

唯寻教学天团授课

根据学校进度与学员能力设计课程

每周一次弥补以往学习过程中的遗漏点

由简入繁的单模块专项练习

帮助学员精准把握考试动向

指导学员在解题思路与方法上建立个人框架与策略

早日达到目标大学要求的标化成绩

更多ALEVEL学习攻略点击

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