Crossword clue: an apparatus consisting of an object mounted so that it swings freely under the influence of gravity

The most common answer is pendulum (8 letters).

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

pendulum 8 letters wn-def

an apparatus consisting of an object mounted so that it swings freely under the influence of gravity