Is it a foul if your tip came off and hit a ball?

[mchpddl1]

Is it a foul if your tip came off and hit a ball, but the ball did not move at all?

[DawRef]

Yes. You are responsible for any equipment YOU bring to the table.

Section 3 Rule 18(a): The striker is responsible for all items including, but not limited to, rests and extensions that he brings to the table, whether owned by him or borrowed (except from the referee), and he will be penalised for any fouls made by him when using this equipment.