Question

read the same passage and think about the evidence that kinetic energy, chemical potential energy, and thermal energy changed.

ellen biked in a straight line along the street. then, to avoid the sun, she moved over to ride under the shade of some trees. but as she pedaled faster and sped up, ellen started to feel hot even in the shade.

consider the following claim:

while ellen was pedaling, chemical potential energy was converted to both kinetic energy and thermal energy.

which piece of evidence best supports the claim?

ellen used her muscles to move faster, and the effort made her hot.

ellen first rode in a straight line, and then she turned.

the sun was bright during ellens bike ride, but ellen rode in the shade.

Explanation:

To support the claim that chemical potential energy (from her body) converts to kinetic (movement) and thermal (heat) energy, we analyze each option:

• Option 1: "Ellen used her muscles to move faster, and the effort made her hot." Using muscles involves chemical energy (from food) for movement (kinetic) and the effort producing heat (thermal), matching the energy conversion.
• Option 2: Her path (straight then turn) relates to direction, not energy conversion.
• Option 3: Sun and shade relate to external heat source, not her body's energy conversion.

Answer:

Ellen used her muscles to move faster, and the effort made her hot.