Lesson 12Using a Trundle Wheel to Measure Distances

Learning Goal

Let’s use our trundle wheels.

Activity 1: Measuring Distances with the Trundle Wheel

Problem 1

To use the applet:

  • Choose a diameter for the wheel, and enter a number 1–5 for the path you will measure.

  • Watch carefully to keep track of the number of rotations that the wheel makes before it stops.

  • Try three different diameters for the same path, and compare your results.

  • Answer the questions.

open applet in presentation mode

  1. Measure the path with your trundle wheel three times and calculate the distance. Record your results in the table.

    diameter

    number of rotations

    computation

    distance

    trial 1

    trial 2

    trial 3

  2. Decide what distance you will report to the class. Be prepared to explain your reasoning.

  3. Compare this distance with the distance you measured the other day for this same path.

  4. Compare your results with the results of two other groups. Express the differences between the measurements in terms of percentages.

Print Version

Earlier you made trundle wheels so that you can measure long distances.

If you do not have a trundle wheel, you can use an applet to simulate measuring. Your teacher will tell you a path whose distance you will measure.

  1. Measure the path with your trundle wheel three times and calculate the distance. Record your results in the table.

    diameter

    number of rotations

    computation

    distance

    trial 1

    trial 2

    trial 3

  2. Decide what distance you will report to the class. Be prepared to explain your reasoning.

  3. Compare this distance with the distance you measured the other day for this same path.

  4. Compare your results with the results of two other groups. Express the differences between the measurements in terms of percentages.