To make a mousetrap car move, string must be attached from the lever arm to the axle and wound around it. Then when the mousetrap car is released, the string is pulled from the drive axle, causing it to move forward. You need a mousetrap car base, a mousetrap, string, a long lever arm and an axle hook.Continue Reading
Remember that the string needs to be quite long because it propels the mousetrap forward. Tie the string to the tip of the lever arm. It is recommended to use Kevlar fishing line as the string.
The axle hook is where the other end of the string is attached. Attach an axle hook, and glue it in place so that it doesn't move around.
Tie a loop knot by folding the string and tying a traditional knot with the folded part. Then pull the loop tight.
Wind the string around the drive axle by turning the wheels in the opposite direction of the mousetrap car's intended motion.
Once the string is fully wound, the mousetrap car can be released. It pulls the string from the drive axle, which propels the car forward.