tán covers anything that snaps, springs or vibrates back:
弹钢琴 (play piano - fingers flicking keys),
弹簧 (a metal spring),
反弹 (bounce back / market rebound),
弹性 (elasticity). The formal sense 'to impeach' in
弹劾 also takes tán - historically 'to flick / level an accusation at' an official.