Collided: Triggers when the input object collides with another object, including the floor.

2nd Object: Outputs the object that the input object collided with. It'll output "None" if collided with the floor.

Impulse: Outputs the impact force of the collision (how hard did they collide). Specifically, impulse is a change of momentum of an object.

Normal: Outputs the direction of the impact from the object that the input object collided with.