速度与距离-时间图
Speed & Distance-Time Graphs
使用公式 速度 = 距离 ÷ 时间 计算平均速度，在距离-时间图上呈现行程，并把斜率理解为速度、把水平段理解为静止时段。
Calculate average speed using the equation speed = distance ÷ time, represent journeys on distance-time graphs, and interpret gradient as speed and flat sections as stationary periods
学习证据 / Evidence
- 使用 速度 = 距离 ÷ 时间 计算平均速度，并写出正确单位（米/秒、千米/小时）。
- 为给定行程画出距离-时间图，坐标轴和标注正确。
- 能读取距离-时间图，判断速度、停留点和行驶方向。
- 能识别距离-时间图上哪一段代表最快速度。
- Uses speed = distance ÷ time to calculate average speed with correct units (m/s, km/h)
- Draws a distance-time graph for a given journey with correct axes and labels
- Reads a distance-time graph to determine speed, stopping points, and direction of travel
- Identifies which section of a distance-time graph represents the fastest speed
评估问题 / Assessment
如果{{name}}在地图上记录了一次骑车出行，知道行驶距离和所用时间，{{name}}能计算出平均速度，并画出一条包含午餐休息的粗略行程图吗？
If {{name}} tracked a cycle ride on a map and knew how far they went and how long it took, could they calculate the average speed — and then sketch a rough graph showing the journey including a stop for lunch?