How to distinguish between different actors on collision

I am making a basic space shooter for a project, and i want the game to distinguish between the player ship colliding with a Bullet and with a Powerup. How can i make specific actors have different effects on colisions?

On collision or Overlap you, Cast the actor with what you wish to see it be. Using casting success or fail you can work out what you have hit or overlap.

On a cast failed you can try cast again to something else.