E.g. I fill a bowl with hot water and then place a ball in it, the ball will heat up. Does the rate at which the ball heats up change if that ball is spinning on the surface or moving around in the water, vs. sitting still?
In: 1
Yes.
Moving the ball will being more got water into contact with the ball’s surface more often and speed up heat transfer. This is why we stir things to equalize the temperature.
Without motion, the water touching the ball will quickly cool down and you need convection to drive the circulation of new hot water. Movement speed that up, like the fan in a convection oven.
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