I need help with collisions

I am trying to make a working tube slide but the ball keeps bouncing off it instead of going in (this is using the unity essentials) how would i fix it.

Could you explain when’s the ball bouncing and what kinda shape does the tube have?
Any pictures or videos would help. :smiley:


when it goes to the opening on the slide the ball will collide with it as if it was a wall.