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This mouse trap car is more for speed… Simple mouse trap car with instructions Physics Projects, Engineering Projects, Stem Projects, Car.The most common way to propel a mousetrap car is to attach one end of a string to a mouse trap's snapper arm and the other end of the string to an axle hook. Build a Mousetrap Car · 1. Cut four wheels out of a piece of foam board or corrugated cardboard (adult supervision is necessary). · 2. Make the back wheels about