读懂距离-时间图
Reading Distance-Time Graphs
读取并绘制运动物体的距离-时间图；将线条的斜率（陡峭程度）理解为速度；识别静止时段（水平线段）、匀速运动（斜直线），并通过比较斜率判断相对速度；利用速度=距离÷时间，从直线段的斜率计算平均速度。
Read and plot distance-time graphs for moving objects; interpret the gradient (steepness) of a line as speed; identify stationary periods (horizontal sections), constant speed (straight diagonal lines), and relative speeds by comparing gradients; calculate average speed from the gradient of a straight-line segment using speed = distance ÷ time
学习证据 / Evidence
- 读取距离-时间图，并描述每个阶段正在发生什么——运动、停止、返回
- 根据距离-时间图中直线段的斜率计算速度
- 根据一段包含停留和速度变化的行程文字描述，绘制距离-时间图
- Read a distance-time graph and describe what is happening at each stage — moving, stopped, returning
- Calculate speed from the gradient of a straight section of a distance-time graph
- Sketch a distance-time graph from a written description of a journey with stops and speed changes
评估问题 / Assessment
如果{{name}}看到一张中间有一段水平直线的距离-时间图，能否解释那一段代表什么，并指出图上哪一部分速度最快？
If {{name}} sees a distance-time graph of a journey with a flat section in the middle, can they explain what was happening then — and point to which part of the graph shows the fastest speed?