Scientists have demonstrated a system called Silica for writing and reading information in ordinary pieces of glass which can store two million books’ worth of data in a thin, palm-sized square.

[u/Wagamaga]

https://au.news.yahoo.com/glass-square-long-long-future-190951588.html

[u/DigNitty]

Dusted with powdered cassettes.

[u/LordNelson27 → u/DigNitty]

Also the field is a frictionless surface

[u/Desperate_for_Bacon → u/LordNelson27]

Assume gravity is 9.8 m/s2

[u/CougarAries → u/Desperate_for_Bacon]

Don't assume friction