I want one word which means do something carelessly.
e.g. (1) Suppose I kept a book near the edge of the stand in home and while I was going out I said to my brother please don't cause it to fall down by carelessly touching or pushing it.
e.g. (2) I plugged TV wire to the switch but the wire was hanging loosely because its length was very big than the distance between TV and switch so I told my brother "please be careful otherwise you will cause it to shake then it will unplug or something"

Please help me.