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Making and Improving a Simple Accelerometer
-string and washer

Test it in a variety of situations 

1. circular instead of planar motion
2. can't read it when it swings (where was top?)
3. broke, tangled, lost
4. no scale or way to capture instantaneous (ie. max) acceleration
5. not enough swing space (arm too short to keep iwasher at eye level)

Make (or diagram and describe) Improvements