Question

The picture shows a woman running.



What is the main type of energy conversion taking place?

(3 points)

Mechanical energy is converted to thermal energy as the energy from movement creates heat in the surrounding air.

Chemical energy is converted to mechanical energy as the energy from digested food provides energy for movement.

Thermal energy is converted to mechanical energy as the energy from heat provides energy for movement.

Mechanical energy is converted to chemical energy as the movement from movement creates reactions in the surrounding air.
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Answer 1

Answer: Chemical energy is converted to mechanical energy (the second choice).

Explanation: The runner’s muscles use chemical energy from digested food (ATP) to do work and produce motion (kinetic energy). Some of that chemical energy also becomes thermal energy as a byproduct, but the primary conversion is chemical → mechanical.