Assertion: coaster's car | /r/HasAspect | potential energy
Facets:
value: at certain points
type: TEMPORAL
Source sentences:
text: Potential and kinetic energy can be exchanged for one another, so at certain points the cars of a roller coaster may have just potential energy (at the top of the first hill), just kinetic energy (at the lowest point) or some combination of kinetic and potential energy (at all other points).