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“Hit Me With Your Best Shot”

“Hit Me With Your Best Shot”. Measuring Forces Applied to a Punching B ag. http:// www.youtube.com/watch?v=lGI7VmsTle4. Daniel Bergeron, Luke Bosse , Jennifer Farrar, Kristi Harrison, Alex Patel, and Brandon Smith. Overview. Objective Materials Methods Data and Results Calculations

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“Hit Me With Your Best Shot”

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  1. “Hit Me With Your Best Shot” Measuring Forces Applied to a Punching Bag http://www.youtube.com/watch?v=lGI7VmsTle4 Daniel Bergeron, Luke Bosse, Jennifer Farrar, Kristi Harrison, Alex Patel, and Brandon Smith

  2. Overview • Objective • Materials • Methods • Data and Results • Calculations • Data Logger Comparison • “Kid-friendly” lesson • Conclusion

  3. Objectives • Create a punching bag that will measure acceleration using Wiimote accelerometers • Calculate a maximum applied force using acquired data • Compare two different accelerometers

  4. Materials • Wiimote • DarwiinRemote software • iPhone DataLoggerapplication • Duffel bag • Scale

  5. Methods • Set up punching bag • Connect Wiimote to Darwiin program via Bluetooth • Collect data from different test trials • Analyze data in Microsoft Excel to find maximum force • Compare Wiimote data to cell phone accelerometer data

  6. Methods Figure 1: (a) Punching Bag. (b) Hanging set up

  7. Data and Results Figure 2: Acceleration output in each directional axis

  8. Data and Results Resultant Acceleration Figure 3: Max acceleration in the z-axis Figure 4: Resultant Acceleration

  9. Data and Results Figure 5: Max acceleration in z-axis. (a) amax= -4.9 g (b) amax= -4.22 g

  10. Calculations • F=ma Table 1: Values used to calculate max force

  11. Data Logger Comparison Figure 6: Comparison of the data collected from the Wiimote and the iPhone during the same trial

  12. “Kid-friendly” lesson • What is an accelerometer? • Newton’s Second Law • How can a Wiimote be used to measure acceleration? • How does the iPhone data compare to the Wiimote data? • How do we use the graphs?

  13. Summary • We aimed to create a kid-friendly exercise to demonstrate biomechanical principles • Accelerometer data can easily be recorded and analyzed to calculate an applied force

  14. Summary • Our project is a very basic model with potential for numerous other applications of more technical design Figure 7: LoadStar Sensors boxing training technology

  15. Questions?

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