Does kinetic energy affect temperature of an object?

Question

Imagine a fundamental particle at rest with respect to ground frame and has temperature $x$ degrees celsius and imagine a 'similar' particle moving at a very high speed (take any value which would affect temperature significantly). So the particle moving has temperature greater than $x$ degrees celsius or exactly equal to $x$ degrees celsius?

Answer 1

Temperature is a measure of internal energy.

So if in any process the internal energy changes then the temperature will change.

For ideal gases $ΔT=ΔU/nCv.$

Now Internal Energy is the sum of all possible intrinsic energies in a system, which includes microscopic Kinetic Energy (not macroscopic), so if the net sum of these energies changes only then will the temperature change.

Since in this case only the macroscopic Kinetic Energy changes ( assuming all other microscopic energies are constant).

Temperature will remain constant.