- A regular Birthday Balloon
- Empty cereal box or a piece of cardboard
- Four Bottle Caps
- Two thick wooden straws
- One plastic straw
- Scotch tape
Drilling holes for wheels
With the help of something sharp, make four holes in the cereal box such that two holes are on each side and are at equal distance from each other.
Putting wooden straws in hole
Put the straw in a hole at one side and slide it out through a hole on the other side. Repeat the same for the other two holes by sliding a straw thorough them.
Fixing the Wheels
Using glue, attach the four bottle caps one by one to the tip of the straw ends such that the straw is exactly on the center of the bottle cap.
Filling the Balloon
Insert a straw in the empty balloon and put scotch tape around it. Now blow the balloon and set it in the middle of the box by taping it down. Make sure that the opening of the straw is kept closed and is on the back of the car.
Releasing the Balloon
Finally, as you release the straw, it will allow the air to pass out of the balloon and the car will move in the opposite direction of the escaping air.