Baby Professor 
The Effects of Force and Motion on Simple Machines | Changes in Matter & Energy Grade 4 | Children’s Physics Books 

There are simple machines all around you. Some may look exactly what they are while others have been built to be a little more complex. In this book, you will learn about the science behind simple machines and how they are affected by force and motion. You will also read about the incline plane, the lever, the pulley, the screw, the wedge, and the wheel and axle.

Giới thiệu về tác giả

Baby Professor showcases a collection of subjects that are educational for kids to help them learn how to do something themselves, exactly how something is done or how it came about. Children love to learn through attractive visuals and Baby Prof. is ideal to get your child the head start he or she needs for the future. Our Motto – ‘Learning is Fun, so let’s Make it Fun to Learn’.