About: http://webisa.webdatacommons.org/216903276

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	There is no force other than gravity and normal reaction (balancing each other) and yet the ball accelerated (in a direction perpendicular to both).
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com