"Dragsters" by Matt Doeden is very basic book that discusses racing cars. It is written at a 2.2 Accelerated Reading level and would be a good book for children who are intimidated by the sight of "too many" words on a page. The following text from the first page will give you an example of what you'll find as far as difficulty and number of words:

Race Day

A top fuel dragster waits at the
starting line. A green light flashes.
Tires squeal. Smoke fills the air.

Chapter headings include:
Race Day
Dragster Design
Gripping the Track
Dragsters in Action

Pictures cover one and two pages and include arrows which point to various features of race cars and race tracks like, engine, drag strip, wing, Christmas tree. There is a small glossary at the end which explains and expands on terminology. Also included are ideas for further reading and relevant internet sites. ( )