Question

When a liquid contained in a bucket is stirred and places for some time, it comes to rest?

Answer 1

It comes to rest because the liquid that is stirred loses its kinetic (movement) energy by means of friction with the bucket and itself (also air, it's effect is really small though).

The kinetic energy will be transformed to heat and thus, both liquid and bucket will heat up. This change in temperature is so low that you won't really notice it in your day to day life.

The “ideal liquid” in hydraulics is a liquid that doesn't lose energy to friction (with itself, the bucket,…) and thus wouldn't stop moving once stirred but such a liquid is yet to be found.

Thanks,

regards ayushmaan