The Stubborn Car

Think of a way to design and construct the stubborn car: a car that will always return to its original place no matter how far it is rolled away from its starting point.

Tip: How can you track the rotary motion of the car’s wheels?

This challenge provides a great introduction to the idea of a proportional control.

Although the attached lesson plan was written for the RCX, this is a challenge idea that could be implemented with the EV3 or NXT.


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The Tufts Center for Engineering Education and Outreach (CEEO) in Boston, Massachusetts, is dedicated to improving engineering education in the classroom, from Kindergarten to college. The Center houses faculty, staff, and graduate students from engineering disciplines and the education department.

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