Duling 
Push and Pull [PDF ebook] 

Let’s get moving! Objects move when they are pushed or pulled. This book teaches young readers in kindergarten to grade 2 what happens when we push or pull an object, including discussions of speed, strength, direction, and what happens when objects touch or collide. This collection introduces a variety of science topics for early learners based on physical science NGSS standards. From motion to energy supplied by the sun, these books present complicated information in easy-to-understand language and provide kid-friendly examples. Each book includes an activity that supports further comprehension