What must be true for a robot to run straight?

For a robot to run straight, it is essential that the wheels operate at the same speed. When both left and right wheels turn at the same rate, the robot can maintain a straight path. If one wheel is moving faster than the other, the robot will turn and not move in a straight line. This precise synchronization allows for effective control over the robot's trajectory, ensuring it progresses forward in a straight direction without veering to one side.

While balanced weight distribution, a fully charged battery, and properly calibrated sensors can contribute to the overall performance of the robot, they do not specifically address the fundamental requirement of equal wheel speed needed for straight movement. Therefore, maintaining the same wheel speed is the key factor for achieving straight-line motion.