In terms of making the bar vibrate, the rosin is responsible for making your fingers stick and slide as they move across the bar. In turn, this repeated stick and slide action sets up vibrations in the bar. This is caused due to ~natural frequency~. since the rosin and the rod contain the same natural frequency, the vibrations starts to create a high pitched noise.
Welcome to the Physic demonstration of the Resonating Rods, where you will be amazed of what you learn today!
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