4 ms·

I have a hard time believing how gravity could be measured at such a small scale. Is it possible to video record the experiment? Maybe with some layman explanat

• bookofjoe 7y ago
  >I would like to make my own gravity experimentation. Is this something I could do at home? Best EVER definition of an optimist.
  • benibela 7y ago
    Many gravity experiments can be done at home For example, drop an apple on their head
    • bookofjoe 7y ago
      Good point
• alphydan 7y ago
  Start by measuring it over a few cm. Their setup is "the same" setup Cavendish used in the 18th century (a torsion balance). Read about it here: http://www.michaelbeeson.com/interests/GreatMoments/Cavendish.pdf http://www.michaelbeeson.com/interests/GreatMoments/Cavendis... or watch this beautiful video explaining the idea: https://drive.google.com/file/d/0B1NTp_zR8Gl7VTJ2aU55cWQzd2s/view https://drive.google.com/file/d/0B1NTp_zR8Gl7VTJ2aU55cWQzd2s... That will give you a flavour of the difficulty involved. Below those sizes, electrical forces start making your experiment very difficult (electrostatic, van de Waals), and any vibration will pollute your data. This is where the "can't do it at home" starts to read its head (something to compensate the vibration of buses driving nearby, a lab with no static electricity or magnetic fields anywhere, etc, etc) Beyond ... the Casimir effect places a limit to the lengths you can reach.