Question

After Pedro had breakfast, he went for a run. Identify at least three energy transformations that had to take place to allow Pedro to complete his run. Then use evidence to support the claim that energy in this system was conserved as it was transformed.

Body temp while eating = 37*c After Running = 40*c

Answer 1

The potential energy stored in the body chemically. That potential energy is then released when the body put in motion.

Answer 2

Answer: 1) Chemical to mechanical (calories -> muscle contractions)

2) mechanical to mechanical (muscle -> motion)

3) mechanical to thermal (motion -> heat from the body causes sweating)

Explanation: When Pedro ate breakfast, he consumed the chemical energy, which is a form of potential energy, that was stored in his breakfast. When he went for a run, that chemical energy transformed into mechanical energy, which is a form of kinetic energy. That mechanical energy then transformed into thermal energy while he was running, which is how his temperature raised after he was finished running. The energy in this system was conserved as it was transformed because the energy was constant. As the energy was being transformed between different types, the total amount of energy remained unchanged.