Final answer:
In a high school physics question about a toy car on a loop-the-loop track, air resistance is typically the factor that can be ignored in a simplified model, as it is usually negligible compared to other forces.
Step-by-step explanation:
In a toy car scenario with a loop-the-loop, when analyzing the physical factors that affect the system, certain elements can often be simplified or ignored to focus on the core principles at play. Among the listed factors a) Rotational effects from the wheels, b) Friction, c) Air resistance, and d) Gravity, the one that can typically be ignored in the simplified physics problem is air resistance. In many high school physics problems, air resistance is considered negligible especially if the question does not explicitly state that it should be taken into account. This simplification is made because air resistance is often much smaller in magnitude compared to the other forces acting on the toy car, such as gravity, and it can complicate calculations significantly. Therefore, when dealing with idealized situations like a toy car on a frictionless track, air resistance is often the factor that can be ignored. However, in a more realistic scenario, air resistance could have a noticeable effect on the motion of the toy car.