Assertion: newton's ball | /r/HasProperty | constrained to straight path
Facets:
value: by the strings in the cradle
type: OTHER
Source sentences:
text: For the case of two balls constrained to a straight path by the strings in the cradle, the velocities are a single number instead of a 3D vector for 3D space, so the math requires only two equations to solve for two unknowns.