Attach an inflated balloon to the end of the straw that is present on the top of the bottle. Make a grooving on the top of the plastic bottle and fix a straw in the hole in such a way that a portion of straw is present on the top, while the rest part of the straw lies inside the bottle. Attach four bottle caps to the ends of the straws with the help of glue. Cut a straw in half, insert both the straw pieces into the pair of grooves.
First of all, place the bottle horizontally on the table and make two pairs of grooves on the curved surface of the bottle near the opening and the base. The main items required to make a balloon car include one plastic bottle, two straws, four bottle caps, one balloon, and glue.
A balloon car is one of the simplest physics project that one can make at home with the help of easily available objects.
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