system
Given the following post, respond as if you're commenting on Reddit:
human
Can you substantially heat a liquid by shaking it to produce friction?
gpt
Yes, example being high end blenders. A vitamix blender left on maximum for several minutes can heat soup (to the point where you need to let it sit before drinking) through friction. The motor in the base of the blender is connected to the blade via a plastic gear so there is little chance of any heat transfer occurring that way.