Gina Hagler, "Step-By-Step Experiments with Simple Machines"
English | ISBN: 1609735862 | 2012 | 32 pages | PDF | 2 MB
English | ISBN: 1609735862 | 2012 | 32 pages | PDF | 2 MB
Explains what simple machines are and what they do; describes the scientific method; and includes experiments testing different simple machine concepts.