Is the trombone a percussion instrument?

No, a trombone a brass instrument along with trumpets, tubas, and French Horns that are played by buzzing your lips into a cup shaped mouthpiece. A percussion instrument is an instrument that is played striking it with your hand, a stick, a mallet, or a beater. Some examples of percussion instruments are snare drums, bass drums, cymbals, timpani, and xylophones.