Assertion: roller coaster's speed | /r/HasProperty | critical factor
Facets:
Source sentences:
text: From the early days of the ride, speed has been a critical factor in the entertainment value of a ride and a hallmark of the advancing coaster technology.
text: This minimum speed is referred to as the critical velocity, and is equal the square root of the radius of the loop multiplied by the gravitational constant (v c = (rg)1/2).