What main energy conversion occurs? (1 point) Responses Thermal energy changes into mechanical energy because heat provides energy for motion. Thermal energy changes into mechanical energy because heat provides energy for motion. Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion. Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion. Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner. Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner. Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.

Question

What main energy conversion occurs? (1 point) Responses Thermal energy changes into mechanical energy because heat provides energy for motion. Thermal energy changes into mechanical energy because heat provides energy for motion. Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion. Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion. Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner. Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner. Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.

Answer 1

Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.

Answer 2

The correct answer is:

Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner's motion.

Answer 3

The main energy conversion that occurs in this scenario is "Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion."

To understand why this is the correct answer, let's break down the options:

Option 1: "Thermal energy changes into mechanical energy because heat provides energy for motion."
This option describes a possible energy conversion, but it is not the main one in this scenario. While thermal energy does play a role in the runner's motion by providing heat for muscle contractions, it is not the primary conversion occurring.

Option 2: "Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion."
This is the correct answer. The primary energy conversion in this scenario is the conversion of chemical energy, obtained from food during digestion, into mechanical energy that powers the runner's motion.

Option 3: "Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner."
This option describes a potential energy conversion, but it is not the main one in this scenario. It is true that some mechanical energy may convert into thermal energy due to friction and air resistance as the runner moves, but it is not the primary conversion occurring.

Option 4: "Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air."
This option is incorrect. Mechanical energy does not convert into chemical energy in the surrounding air due to the runner's motion.

In summary, the correct answer is: "Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion."