About: http://webisa.webdatacommons.org/116573826

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	Then explain to students that gravity is a force that keeps objects in motion, and friction works in opposition to gravity to help objects stop.
http://www.w3.org/ns/prov#wasQuotedFrom	discoveryeducation.com