A book all about pushing and pulling, friction, and gravity. There are forces at work whenever you throw a ball, run up the stairs, or push your big brother off the couch! Includes an experiment on friction at the end of the book.
A book all about pushing and pulling, friction, and gravity. There are forces at work whenever you throw a ball, run up the stairs, or push your big brother off the couch! Includes an experiment on friction at the end of the book.