Assertion: body's force | /r/HasProperty | exerted by the ground
Facets:
value: on the person
type: TRANSITIVE-OBJECT
value: upward
type: MANNER
Source sentences:
text: For example, a person standing on the ground experiences zero net force, since a normal force (a reaction force) is exerted by the ground upward on the person that counterbalances his weight that is directed downward.