Which combination of motor power levels is most effective for following straight lines?

The most effective combination of motor power levels for following straight lines is when the power levels are close together. This is because maintaining a balance in power allows the robot to move in a straight trajectory rather than veering off to one side. When both motors receive similar power levels, the robot can accurately navigate its path without drifting.

In situations where the power levels are far apart, one motor would work harder than the other, which could cause the robot to turn or curve instead of traveling straight. Random power levels introduce inconsistency in movement, potentially leading to erratic behavior rather than a steady course. Setting one motor's power level to zero would halt that side of the robot, effectively causing a sharp turn or spin instead of enabling a straight movement.

Thus, utilizing power levels that are close together ensures that both motors work in harmony, facilitating a more precise and controlled movement along the desired path.