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Exercise & Motion Physics

Collecting motion data

There are a number of apps (e.g. MotionX)  that allow users to monitor their latitude, longitude and elevelation over time.  You can analyze your power, kinetic energy, gravitational potential energy, and other parameters during exercise by analyzing details of of the files that are generated by the apps.  The primary file types are:

  • TCX files are created by fitness devices and can have heart rate, cadence and power data along with the standard gps data of time, elevation and coordinates. These files can give the most complete data for fitness analysis.
  • GPX files are created by all other non-fitness gps units and have only time, elevation and coordinates.
  • KML & KMZ files are used to display your track in Google Earth.

Analysis of the physics of your exercise

Sample files:  These are short mountain bike rides that I have taken in the local mountains.  Each trip is a "round trip" in which I started and ended at the same place.  View the course of each using MotionX website and Google Earth. 
Analyze trips - Analyze the  gpx files  of these trips using Utrack

Complete the following calculations
Mass of rider:  200 kg
Mass of bicycle: 20 kg
Mass of each wheel:  2 kg

Maximum speed (km/s)
Maximum gravitational potential energy of rider & bike (joules)
Maximum slope (percent)
Maximum kinetic energy of rider and bike (joules)
Maximum rotational inertia of bicycle
Average power output from starting point to summit (watts)
Maximum power output (watts)

Subpages (1): GPX files