The //code.Node Cart is a four-wheeled cart into which fits the //code.Node. The //code.Node reads the velocity of the //code.Node Cart by detecting the spinning magnet on the cart axle. The low-friction wheels are spring-loaded to protect them if the cart falls off the table.
The //code.Node Cart is also useful without the //code.Node as a simple dynamics cart. A motion sensor can be used to track the motion of the cart..