A simple two-motor NXT car needs a non-powered slider, wheel, or wheels of some type. A single wheel is often a good choice, since it is simple to build and makes turning the car easier than a pair of non-powered wheels.
In fact, the “wheel” does not need to be a wheel at all; a slider can be a good substitute.
Four possible third wheels/sliders are shown below: a fixed wheel, a tow-ball slider, a knob-wheel slider, and a castor wheel.
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Barbara Bratzel
Barbara teaches at the Shady Hill School in Cambridge, Massachusetts and works at the Center for Engineering and Education Outreach at Tufts University. She is the author of several LEGO robotics activity books for teachers, most recently STEM by Design.
Latest posts by Barbara Bratzel (see all)
- New Cycles of Dr. E’s Challenges Are Here - 7 February 2019
- Snail Car - 23 August 2018
- Ramp Climber - 23 August 2018
- Does LEGO BOOST Have a Place in Education? - 20 January 2018
- EV3 books - 4 July 2017
