任務Task
捕捉學校運動會中的不同運動，並繪畫相關的距離—時間關係線圖！
Capture different motions on Sports Day and plot distancetime graphs of the motions!
背景知識
Background knowledge:
- 一條斜線代表物體以固定的速率移動。
- 一條水平線代表物體靜止不動。
- 斜率較低的斜線代表物體以較低的固定速率移動。
- A straight line with a slope means theobject is moving with a steady speed.
- A horizontal line means the object is at rest.
- A straight line with a smaller slope means that the object is moving with a lower steady speed.
左邊的曲線的斜率不斷變化，代表物體的速度也在不斷變化。事實上，這條曲線的斜率隨着時間增加，物體的移動速率也在增加。我們也可以這樣分析線圖：在首t秒，物體移動的距離比下一個 t 秒小，因此物體的速率正在增加。
The slope of the curve keeps changing, which means the speed of the object also keeps changing. In fact, the slope of the curve is increasing with time. It means that the object is moving with an increasing speed. We can also read the graph like this: the object travels a smaller distance in the first t seconds than in the next t seconds, so the speed of the object is increasing.
左邊的曲線也代表非勻速運動。曲線的斜率隨着時間下降，代表物體的移動速率正在下降。
The curve on the left also represents a nonuniform motion. The slope of the curve is decreasing with time, which means the object is moving with a decreasing speed.
第一部分—使用應用程式捕捉運動情況Part A—Use an app to capture motions and plot graphs
你可以下載以下的應用程式﹕You can download the following suggested app:
研究如何使用這程式來捕捉運動，並繪畫相關的距離—時間關係線圖。
You can then study how to use it to capture motions and plot the corresponding distance-time graphs.
第二部分—在運動會捕捉不同的運動情況Part B—Capture different motions on Sports Day
100米比賽100 m race
標槍Javelin
跨欄比賽Hurdle race
第三部分—評價和改良Part C—Evaluate and redesign
1.
在課堂上展示和介紹不同運動項目的距離—時間關係線圖 。你亦需利用距離—時間關係線圖來分析每個項目的運動情況。
Present and display your distance-time graphs of different motions. You should also interpret the motion of each sport using the distance-time graphs.
2.
思考自己的結果是否準確，以及如何減少測量過程中的誤差。
Think about if your results are accurate or not and how to reduce errors during measurements.
3.
在課堂後提交學生工作紙。
Submit Student’s Worksheets to your teacher after the lesson.
第四部分—附加資源Part D—Further resources
如果學校有micro:bit或Arduino，你可以把它們連接到超聲波感應器，並用以測量物體的距離。
If micro:bits or Arduino are available at your school, you can connect them with an ultrasonic sensor and measure the distance travelled of a small object.