I both disagree and agree with many of these answers. While adding information will always make more things clear to people, in almost all situations, it is not necessary in these cases. It is perfectly legitimate to say "I dropped my Kindle." even though the material on which it lands makes a difference to the object based on its physical I terrify, the information is not required. Just as if you said " I talked to Jan." as opposed to " I talked to Jan about her attempted suicide." It makes a big difference but is not necessary.
In essence with the use of the verb "to drop," people will know that the object moved to a lower position as a cause of, gravity. They may not know If your Kindle is ok, but they will know the position change of the object just as your dictionary definition's stated.