Materials:

 

1. 1 empty bottle
2. 5 straws
3. 2 wooden sticks
4. 2 light plastic wheels
5. 4 balls or bottle caps
6. 1 balloon
7. Some hot glue
8. Some tape
9. Some cardboard

 

Procedure:

 

Step 1: Cut cardboard into 2 of 10cm x 17 cm, 2 of 13cm x 17 cm, and 1 of 10cm x 13cm with the blade.

 

Step 2: Cut another 10 x 13cm cardboard and cut a rectangular hole with the dimensions of 2cm x 3cm at the center of the cardboard with knives.

 

Step 3: Grab a hot glue gun and set it up correctly for use.

 

Step 4: Glue the 5 pieces of cardboard together with hot glue. Hold the cardboard so that the glue could dry and stabilize.

 

Step 5: Grab 2 long straws and hot glue them on the bottom of the car so that they are parallel to each other and are 8 cm away.

Step 6: Grab 2 sticks and sharpen them so that they can support the wheels.

 

Step 7: Put 1 stick inside the straw on the back of the car, then put the wheels on the stick. Repeat this for the front side of the car.

 

Step 8: Cut a 2 of 1cm x 9cm cardboard and label them A, 2 of 2cm x 9cm cardboard and label them B, 2 of 1cm x 4cm cardboard and label them C, and 2 of 2cm x 3cm cardboard and label them D.

 

Step 9: Glue the A cardboards onto the last 10x13cm cardboard so that it is 1cm away from the center hole as for on the diagram.

 

Step 10: Glue the C cardboards onto the last 10x13cm cardboard so that it forms a 4cm x 9cm rectangle at the center of the board.

 

Step 11: Put the D cardboards inside the rectangle.

 

Step 12: Glue the B cardboards onto the A cardboards so that it seals the D cardboards and turns them into sliding doors.

 

 

Step 13: Glue 3 straws together and cut them to different lengths.

 

Step 14: Stick the straws inside the balloon and seal it with hot glue so that it does not let air through.

 

Step 15: Put the balloon and straw bundle inside the door.

 

Step 16: The car is built, clean up.