About: http://webisa.webdatacommons.org/188632149

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Now, as you mentioned, the system is enclosed and all forces are internal other than gravity.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com