Milkshake machine – engineers way of shaking a milkshake

Steinar writes in with the “engineers way of shaking a milkshake”… –

“Take a powerful DC amplifier, connect it to a large woofer, feed the system with a signal generator, and at the end, just add milkshake. Of course it is also possible to measure the g-force of the shaking” – photos & video.