章节大纲

  • Group of boys sprinting at the start line of a track event.

    Do you participate in track like the boys pictured here? If not, you may have attended a track meet. The boys in the picture are running a 100-meter sprint. Running events in track are named for their distance.
    ::您是否像这里所描绘的男孩子一样参与音轨? 如果没有的话, 您可能已经参加了音轨会。 图片中的男孩子正在跑100米的短跑。 音轨中的运行事件是按距离命名的 。

    What Is Distance?
    ::什么是距离?

    Distance is the length of the route between two points. The distance of a race, for example, is the length of the track between the starting and finishing lines. In a 100-meter sprint, that distance is 100 meters.
    ::距离是两个点之间的路线长度。 例如, 种族的距离是起始线和终点线之间的轨道长度。 在100米的短径中, 这个距离是100米 。

    SI Unit for Distance
    ::SI 远程单位

    The SI unit for distance is the meter (m). Short distances may be measured in centimeters (cm), and long distances may be measured in kilometers (km). For example, you might measure the distance from the bottom to the top of a sheet of paper in centimeters and the distance from your house to your school in kilometers.
    ::距离的 SIS 单位为米(m) 。 短距离可以用厘米( cm) 测量,长距离可以用公里( km) 测量。 例如, 您可以用厘米测量纸页底部至顶部的距离, 从家到学校的距离也可以用公里测量。

    Using Maps to Measure Distance
    ::使用地图测量距离

    Maps can often be used to measure distance. The map in the Figure shows the route from Jordan’s house to his school. You can use the scale at the bottom of the map to measure the distance between these two points.
    ::地图通常可用于测量距离。 图中的地图显示了约旦从家到学校的路线。 您可以使用地图底部的尺码测量这两个点之间的距离。

    Map showing the route from Jordan’s house to school, with a compass and scale.

    Q: What is the distance from Jordan’s house to his school?
    ::问:从约旦的房子到他的学校的距离是多少?

    A: The distance is 2 kilometers.
    ::A:距离是2公里。

    Watch the following video to learn more about how to use a scale on a map to measure distance:
    ::观看以下视频以了解如何在地图上使用比例尺测量距离的更多信息:

    Summary
    ::摘要

    • Distance is the length of the route between two points.
      ::距离是两个点之间的路线长度。
    • The SI unit for distance is the meter.
      ::距离的SI单位是计数器
    • The scale of a map can be used to find the distance between different locations.
      ::地图的大小可以用来查找不同位置之间的距离 。

    Review
    ::回顾

    1. Define distance.
      ::界定距离。
    2. What is the SI unit for distance? Give an example of something you might measure in this unit.
      ::SI单元的距离是多少?请举一个例子,你可以在这个单元中测量一些东西。
    3. Runners in different lanes on an oval racetrack have different starting marks. Explain why.
      ::在奥瓦尔赛道上各行各业的赛车手有不同的起跑标记。请解释原因。
    4. On the map in the Figure , what is the distance between Jordan’s house and the park? 
      ::在图中的地图上,约旦的房子和公园之间的距离是多少?