This HIGHLY EFFECTIVE waves demonstration model is the best I have found to get kids to understand different aspects of mechanical waves, and you can make it yourself with easy supplies!
NGSS MS-PS4-1: Use mathematical representations to describe a simple model for waves that includes how the amplitude of a wave is related to the energy in a wave.
NGSS MS-PS4-2: Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials.
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