By means turned out to be at hand, one can assemble a simple car, in the base of which the most usual mousetrap will locate.
Take ballpoint pens to pieces. Their plastic tubes will be required.
3: Balls and discs
Cut off upper parts of 2 air balloons. Pull them on discs, as it is pictured.
The hooks must quietly move along the entire tube length, but without dropouts. If the hooks fall out, they can be bent with pliers.
5: The center
In the center of the plastic tube, a hole should be made with help of a hook.
6: A lace
Insert the lace into the hole and throw it through the right end of the tube. Tie to the right end the toothpick or a small item, which would not allow the lace to come out back into the tube. Pull behind the end and make sure the lace does not actually come out.
7: A mousetrap
Install 4 hooks in 4 mousetrap angles. Try to make equally sized hollows.
8: Drive mechanism
Insert the first tube as the front wheel drive.
Spool balls on junctions of discs and the tube. Insert discs. Likewise, create the rear wheel drive.
10: An axle
The lace will serve as an axle. Tighten it and attach to the mousetrap as it is pictured.
11: Rear wheels
Connect rear wheels similarly to the front ones.
Carefully attach the lace to the mousetrap mechanism. Now, if any item is put to the trap, it will be activated and it will start the car forward.