CoachA mechanical wave is a disturbance propagating through a material medium — rope, water, air, rock — carrying energy without transporting matter: each piece of the medium swings briefly in place, hands the motion on, and settles back.
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Example 20.2 (No matter transport)
In the stadium wave the “medium” is the crowd: what travels is the act of standing up, while every spectator keeps their seat. On the pond, the ring expands but a floating cork only bobs in place.