videoWind-up Vehicles teaser videoTitle slide: FutureMakers Educator Quick Start, Wind-Up VehiclesLearner slide: the motor is a spring-powered mechanism that you wind and tighten, shown in a close-up of the motor in its holderLearner slide: the axles are attached to the motor and rotate when the spring releases stored energyLearner slide: you have a choice of different diameter wheels, and each makes the vehicle move at a different speed