Wiktionary
a. (context physics English) Of or pertaining to collisions (especially between particles)
Usage examples of "collisional".
Their detailed appearance (like that of their main-belt cousins) immediately implies that they are the products of a violent collisional history.
They provide important clues to collisional processes in the early Solar System.
I believe we are looking at the end-product of a kind of collisional natural selection, in which fragments have been broken off from a larger parent body, and we are seeing only the two pieces, Phobos and Deimos, that remain.
I agree with the messages (13123 as of a few seconds ago) assuring me that the habitations of Sjandra Kei suffered collisional damage within the last six days.
The orbits of the present planets are the orbits of the survivors of this collisional natural selection, the stable middle age of a solar system dominated by early catastrophic impacts.