Any ideas to time trolley crashes to simulate crumple zone

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Discussion Overview

The discussion revolves around methods to time trolley crashes for a lesson on crumple zones, focusing on the practical setup and tools available for recording and analyzing the crashes. The scope includes experimental application and educational techniques.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant suggests filming the trolley crashes and using still images to time the duration of the crash, specifically focusing on the crumple zone effect.
  • Another participant proposes using a digital oscilloscope with an accelerometer or a microphone to record the crash sounds, although they later acknowledge the lack of such equipment.
  • A participant mentions the possibility of using a computer with a webcam to capture the crashes, indicating a potential alternative setup.
  • One participant shares a link to software that allows frame-by-frame analysis of video footage, which could be useful for tracking object features during the crashes.

Areas of Agreement / Disagreement

Participants generally agree on the need for effective methods to time and analyze the trolley crashes, but there is no consensus on the specific equipment available or the best approach to achieve this.

Contextual Notes

Participants express limitations regarding the availability of certain equipment, such as digital oscilloscopes and smartphones, which may affect the methods proposed for timing the crashes.

Who May Find This Useful

Educators looking for innovative ways to teach concepts related to physics, particularly in the context of motion and impact analysis, may find this discussion beneficial.

seth100
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I am trying to do a lesson where I will ask the students to build cardboard shells around trolleys. The aim is the next lesson to crash them and time how long they take to stop, eg the crumple zone.
All I have thought of so far is filming it and using the stills to try time the crash. If anyone has any other ideas about how to go about this be much appreciated. Thanks
 
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seth100 said:
I am trying to do a lesson where I will ask the students to build cardboard shells around trolleys. The aim is the next lesson to crash them and time how long they take to stop, eg the crumple zone.
All I have thought of so far is filming it and using the stills to try time the crash. If anyone has any other ideas about how to go about this be much appreciated. Thanks

Welcome to the PF.

Sounds like a fun project for your students! :smile:

What equipment do you have available? Do you maybe have a digital oscilloscope that you could use? If so, you could either hook up an accelerometer to it (attached to the trolley), or have a microphone at the crash plane to record the sounds. You might be able to use a Smartphone to do the sound recording instead, with an oscilloscope-like graph of the sound of the crash. There are probably already Apps for that... :smile:EDIT -- Come to think of it, there are probably already Apps to take your Smartphone video and play it back frame-by-frame with time stamps...
 
Unfortunately there doesn't seem to be any of that equipment about, however we do have some camera's and some huddles (like an I pad). I don't have a smart phone and the students are not allowed phones in the class, Does anyone know of any free software I could download that would allow me to film the crashes and play them back frame by frame
thanks
 
Hook it up to a computer and use a webcam?
 
https://www.cabrillo.edu/~dbrown/tracker/
In addition to viewing frame by frame, object features can tracked manually or automatically and tabulated.
I get students to use this to analyze projectile motion and collisions of pucks on an air table.
 

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