Friction drive describes toys which are powered by a clockwork motor. Much like wind-up robots, friction drive robots utilise a spring to store energy. The main difference being that the spring is wound using the rotation of the drive wheels instead of a key. As you pull back on the toy, with the wheels in contact with a flat surface, the spring is wound tighter. When the robot is released, the spring unwinds, the stored energy is released and the drive wheels rotate in the opposite direction, propelling the robot forward.
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