books.google.com - Introduces the concept that friction normally accompanies motion for moving objects....https://books.google.com/books/about/The_Friction_and_Motion_Commotion.html?id=nbkDhDPix8kC&utm_source=gb-gplus-shareThe Friction and Motion Commotion
KlevaKids presents entertaining introductions to math and science concepts for preschool and early school age children. These are fun stories that expose children to math and science concepts at an early age. These stories are so much fun that even adults often find them both informative and entertaining.
The Friction and Motion Commotion: Introduction to friction and motion Read to Me