Assertion: acceleration's sign | /r/HasProperty | directed at right angles
Facets:
value: to the radius vector
type: TRANSITIVE-OBJECT
value: always
type: TEMPORAL
Source sentences:
text: The sign of the tangential component of the acceleration is determined by the sign of the angular acceleration ( α {\displaystyle \alpha } ), and the tangent is of course always directed at right angles to the radius vector.