I know this is a very easy situation. if the triangle is a pivot which cant move.

1. only the vector perpendicular to the the beam ( the black line) matters...

however, I have no idea how if the triangle is NOT a pivot and just simply an object that could freely move just like the black ball. AND to treat them not as one object, but two linked object.

in particular, how much of the force given by the red arrow will be converted into rotational and how much into transational.

thankyou in advance