Final answer:
When Isabel pushes the toy car, the energy from her arm is transferred to the car as kinetic energy following the principle of conservation of energy. Some energy might be lost as heat, but it is not the primary occurrence. This is a physics principle that happens in motion transfer.
Step-by-step explanation:
The correct answer to the question is B) the energy in her arm is transferred to the toy car as kinetic energy.
Here's how it works: When Isabel pushes the toy car, the energy from her arm is transferred to the car. This energy from her muscles, a form of chemical energy, is transformed into kinetic energy in the motion of the car. In Physics, this follows the principle of conservation of energy, which states that energy cannot be created nor destroyed, but only transferred or changed from one form to another.
Just to clear any other misconceptions, the other choices are not entirely incorrect but are not the primary occurrences here. Some of the energy in Isabel's arm is lost as heat due to the inefficiency of our muscles (Choice C), but this is not the main energy transfer. The energy in her arm is not turned into potential energy (Choice A) - the kinetic energy in the car could be converted into potential energy if the car went uphill or up a ramp, but it's not directly from her arm. The energy in her arm also does not remain unchanged (Choice D) because she's done work to move the car.
Learn more about Energy Transfer