Put Screws to the Test (Searchlight Books: How Do Simple Machines Work?)
By Unknown Author.
Description
What do jar tops and water-bottle lids have in common? Both of them are screws! Screws are simple machines. They help us to do jobs more easily. But dont take our word for it. Put screws to the test with the fun experiments youll find in this book. - from Amzon
ISBN(s)
0761353232, 9780761353232
