Author:
Johanna O'Day
Subject:
Engineering, Biology
Material Type:
Module
Level:
College / Upper Division, Graduate / Professional
Tags:
  • Biomechanics
  • Walking
    License:
    Creative Commons Attribution Non-Commercial Share Alike
    Language:
    English

    Ch. 2 Problem 2

    Overview

    Chapter 2 Problem 2, takes less than 15 minutes to complete by hand.

    2.2

    Froude number and speed walking

    Yusuke’s average speed is 20,000 m/76.6 min * 1 min/60 sec = 4.38 m/s

    Fr = 4.38**2/(9.81*0.9) = 2.17

    He is able to "walk" with Fr > 1 because his three-dimensional motions are not sufficiently represented by an inverted pendulum.

    Notes: add units, use mathematical expressions.

    Froude number and speed walking

    Race walkers achieve high walking speeds by altering their gait kinematics. In 2015, Yusuke Suzuki of Japan set the world record for the men’s 20-km racewalk with a time of 1:16:36. What was Yusuke’s average speed in m/s and his Froude number at this speed, assuming his leg length is 0.9m? Why is it possible for him to "walk" with a Froude number greater than one?