I would however consider it inappropriate for my offspring to be punished by a teacher in school this way currently.
The direct implications would nowadays imply that it was being done for personal reasons, rather than simply representing someone applying the discipline and punishment standards of the time.
Did the slipper hurt?
Yes it did.
Every stroke of the slipper stung an awful lot.
It was very difficult to remain bending over, and very difficult to keep touching my toes.
In fact I remember changing to holding on to my ankles.
The force of strokes felt as though they would knock me over.
It was a mans big plimsole and I am quite small.
It was also quite noisy, the sound of the whacks was very loud and echoed around the room.