Description Objects need force in order to move. Pushing and pulling are forces. Some objects need a push to move, some need a pull, and others need both. This nonfiction Beginning-to-Read book contains high-frequency words and content vocabulary. Connecting Concepts pages include a word list along with activities to strengthen early science and literacy skills, such as understanding nonfiction text, science in the real world, science and academic language, fluency, and finding further information. Aligns with Next Generation Science Standards for Grades K-3. Note to Caregiver provided..