章节大纲

  • 常规

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  • 单位改划

    How long until we get there?
    ::还要多久我们才能到那里?

    In the interactive below, you can explore the relationship between speed and time. Later in this lesson, you will manipulate and transform units (like miles and hours) into different kinds of units.
    ::在下面的互动中, 您可以探索速度和时间之间的关系。 在此课后, 您将操作单位( 类似英里和小时) 并转换成不同的单位 。

     

    INTERACTIVE
    Speedometer Model
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    You are on a road trip to the Grand Canyon and you would like to know how much longer it will take to get there. Right now you are still 100 miles from your destination. By changing your speed you can also change the amount of time it takes to get there.

    ::您正在前往大峡谷的路上旅行, 您想知道到达大峡谷需要多长时间。 现在您仍然离目的地100英里。 通过改变您的速度, 您也可以改变到达目的地所需的时间 。

    • Drag the blue point along the speedometer to increase or decrease the speed of your car.
      ::沿着速度计拖拉蓝色点,以增加或降低您的汽车速度。
    • The 'Total Time' in red will tell you how long it will take you to travel 100 miles given your current speed.
      ::红色的“总时间”将告诉你,鉴于你目前的速度,你旅行100英里需要多长时间。
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    Progress
    0 / 2
    1.

    You want to travel 100 miles in 2 hours. How fast do you have to drive?
    ::你想在两个小时内行驶100英里 开多快?

    a

    75 mph
    ::75 英里

    b

    100 mph
    ::100 毫米/ 小时

    c

    50 mph
    ::50米时

    d

    35 mph
    ::35米时

     

     

    CK-12 PLIX Interactive: Gelato Pint
    ::CK-12 PLIX 互动: Gelato Pint

    Use this PLIX to practice switching between units when dividing quantities of gelato.
    ::使用此 PLIX 来练习单位之间的切换, 以分隔凝胶数量 。

     

     

     

     

    How much do I weigh on another planet?
    ::在另一个星球上我需要承受多少重量?

    lesson content
    Planets in the Solar system

      Depending on which planet you are on, you would weigh a different amount. Your weight depends on the size and mass of the planet, , and your own mass. 
    ::取决于您所依赖的行星,您将承受不同的重量。您的重量取决于该行星的大小和质量, 以及您自己的质量。

    In this interactive below, use ratios to convert how much you weigh on Earth to how much you would weigh on different planets.
    ::在下面的交互中, 使用比率来转换您对地球的重量 和您对不同行星的重量。

     

    INTERACTIVE
    Your Weight on Other Planets!
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    • Click on a planet and input your weight here on Earth to see how much you would weigh there. 
      ::点击一个行星,输入你的重量 在地球上,看看你会有多重。
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    CK-12 PLIX Interactive: Convert between Metric Units
    ::CK-12 PLIX 交互式: 介于计量单位之间的转换

    You can use the PLIX to compare equivalent values in different systems of measurement.
    ::您可以使用 PLIX 来比较不同测量系统中的等值。

     

     

     

     

     

    How do you switch from miles per hour to kilometers per hour?
    ::你如何从每小时英里转换到每小时公里?

    In the United States, speed  is measured in m iles p er h our ( mph ). In Canada, speed  is measured  in k ilo m eters per h our ( kmh ).
    ::在美国,速度以每小时英里(mph)计量,在加拿大,速度以每小时公里(kmh)计量。

    One speedometer showing miles per hour and another showing kilometers per hour
    Comparison Speedometers

    Example  
    ::示例示例示例示例

    Dave is driving from the United States to Canada . T he speed limit  on the highway is 65 miles per hour . He wants to see his speed above 100, but he knows going 100 mph is extremely dangerous. Since he is on his way to Canada (where speed is measured in kilometers per hour), he wonders if he can reach a speed of 100 but in kilometers per hour. Will Dave be able to reach 100 kph without going over the speed limit of 65 mph?
    ::戴维正在从美国开车到加拿大。 高速公路上的速度限制是每小时65英里。 他希望看到他的速度超过100英里,但他知道去100英里是极其危险的。 由于他正在前往加拿大的路上(每小时速度以公里计 ) , 他想知道他是否能够达到每小时100公里的速度。 戴夫能否达到100公里,而不会超过65英里的速度限制?

    Use the interactive below to compare the unit speeds between kilometers per hour (KPH) and miles per hour (MPH).
    ::使用下方交互速度比较单位速度,每小时公里(KPH)和每小时英里(MPH)之间的单位速度。

     

     

    INTERACTIVE
    MPH to KPH Speedometer
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    • Drag the red point to increase the speed. Displayed in the gray box is the equivalent speed in kilometers per hour rounded to the nearest hundredth.
      ::拖曳红色点以加快速度 。 在灰色框中显示的相等速度, 以每小时以公里计, 四舍五入到最接近的百分位 。
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    How fast is Usain Bolt?
    ::乌赛恩·博尔特有多快?

    lesson content
    On the right: Usain Bolt

    Usain Bolt, also known as "Lightning Bolt,"  is the fastest sprinter of all time. He once ran 100 in 9.58 seconds ! How many miles per hour can he run?
    ::Usain Bolt,又名“灯火”是所有时间中最快的短跑者。他曾经在9.58秒中跑过100秒!他每小时跑多少英里?

    Given the number of meters and seconds Usain Bolt ran, use the interactive below to observe how to convert those units to miles per hour (MPH).
    ::鉴于Usain Bolt运行的米数和秒数,请使用下面的交互式数据观察如何将这些单位转换为每小时英里(MPH)。

     

     

    INTERACTIVE
    M/s to MPH Conversion
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    • Input meters and seconds and see how it is converted to miles per hour.
      ::输入计和秒,看看如何转换成每小时英里。
    • The red text represent the units that cancel out when multiplied. 
      ::红色文字代表乘以时取消的单位。
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       Summary
    ::摘要

    • Converting units is similar to find equivalent ratio . Multiply the number by the conversion factor.
      ::转换单位与查找等值比率相似。乘以转换系数,乘以数字。
    • Some conversions might require more than one  step, for example changing meters per seconds to miles per hour.
      ::有些转换可能需要不止一步,例如将每秒的米数改变为每小时的英里数。