1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Anybody still use ticker tape?

  1. Sep 3, 2015 #1
    Just dug out some ancient ticker tape machines to use as an alternative way to measure g by free fall. I'm having problems getting reliable marks on the tape, sometimes the strike bounces and leaves two marks, sometimes marks don't get left at all, especially at low speed at the start of the trace. Anyone got experience of this?
  2. jcsd
  3. Sep 4, 2015 #2


    Staff: Mentor

    We used an Atwood machine with a vibrating pen. As the mass fell the pen would trace out a sine curve that got stretched out as the mass fell.

    Then we used the measurements between wave peaks and the wave peak number (* time for the pen to move back and forth) to compute the value of "g" using the s= (1/2) * g * t^2
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook