Forces and motion are at work all around you when you kick a ball, ride a bike, or drop a book. But what exactly are forces? And how do they make things move? For thousands of years, scientists have been testing hypotheses about forces and motion and learning from the results of their experiments. These lead to more questions: Why do you speed up when you're biking down a hill? Why are heavier objects harder to pull? Why doesn't the moon float off...

"This title will explain the force of gravity. Readers will learn about Isaac Newton and the falling apple, what gravity is, how it affects their daily lives and the entire universe! This title is complete with carefully chosen photographs and labeled diagrams to help visual learners. Aligned to Common Core Standards and correlated to state standards"--Provided by the publisher.

"A graphic nonfiction volume that introduces the force of gravity and its effects on Earth and the universe. Features include several photographic pages, a glossary, additional resource list, and an index"--

"Two kids explore the ups and downs of gravity in this introduction to physical science"--

Presents the basic principles of gravity, a history of how the theory was developed, the revisions made by Albert Einstein, and descriptions of how gravity works in space, with examples from America's space program.

"Simple text and color photographs introduce gravity, including its history and how it affects Earth--in both English and Spanish"--

"When Dr. Cosmic's class meets Commander Nova, the school astronomer, they know their next lesson will be out of this world! With the help of Dr. Cosmic's latest invention--a planetarium--the class must complete four challenges. Each time the planetarium shifts and the atmosphere changes, the students find themselves floating from planet to planet. They put their new magnetic antigravity belts and trusted handbooks to the test to figure out where...

"Y si tus pies se levantaran solos del suelo? Que es lo que impide que todo flote en el espacio? Se trata de LA GRAVEDAD, una fuerza invisible que hace que los objetos se atraigan entre si. Jason Chin, como es habitual en su trayectoria, ha elegido aqui un tema complejo y atractivo y lo ha hecho comprensible para los lectores mas jovenes; el resultado es un libro inusual, innovador y muy hermoso." --Amazon. "What keeps objects from floating out of...