I play with a small ball in my home. I was experimenting with different ways to hit a ball along the ground and saw a somewhat strange reflection from the wall.
If I hit the ball right at the middle (it only has a forward roll), and it hits the wall at an angle, it reflects away making an equal angle from the normal to the wall to the other side as expected (of course, the collisions are not elastic and the floor is not regular, so there is some negligible error). However, if I hit the ball at its side almost tangentially (giving it a mixture of a forward spin and a side spin), it hits the wall and comes back along the same side of the normal to the wall but not necessarily making an equal angle (depending on how perfectly I hit it tangentially). Basically what I see is - I am hitting the ball on its right (and to my left) and it is coming back to me. Does this have something to do with the friction from the wall which is not present when the ball is hit with only forward spin?