Final answer:
The average kinetic energy of the particles that make up both your body and your friend's body would be the same if both temperatures were 38 degrees Celsius because temperature measures the average kinetic energy of particles.
Step-by-step explanation:
If both you and your friend have a body temperature of 38 degrees Celsius, the average kinetic energy of the particles that make up both of your bodies would be the same. This is because temperature is a measure of the average kinetic energy of the particles in matter. Therefore, no particle in either of your bodies would have a greater average kinetic energy solely based on temperature alone.
According to the kinetic-molecular theory, temperature is directly related to the average kinetic energy of the particles of a substance. When two systems are at the same temperature, it implies that their particles have the same average kinetic energy, assuming no chemical reaction or phase change is occurring that affects the distribution of this energy.