gravitation

Illustrations and simple text describe motion, friction, and force, and how things move.

Defines gravity, one of the four forces that control the universe and the most mysterious, and discusses Newton's theory about the force of gravity which still didn't explain how gravity works at a distance. Einstein understood that gravity and acceleration are interchangeable and thus devised his theory of general relativity which explains how gravity works. Includes chapter notes and an index.

An introduction to gravity that defines what it is, discusses the study of it, describes what the effects of more or less gravity on Earth would be, and includes a related activity.

Presents information on the scientific principle of gravity, how it was discovered, and how knowledge of its effects is applied by astronomers. Includes directions for a simple experiment.

Explains how gravity works, how to conduct an experiment with it, and where to find more information on it.

Contains activities and information about how gravity works.

An explanation of gravity and the discoveries that have been made about it--although we still don't know exactly how it works.

Consists of the text of Einstein's Stafford Little Lectures, delivered in May, 1921 at Princeton University. Includes an appendix discussing advances in the theory of relativity since 1921, and an appendix on his Generalized Theory of Gravitation.

An introduction to gravity with photographs and illustrations that explains what gravity is, how gravity affects the Earth and solar system, Albert Einstein's general theory of relativity, the effects of gravity on the human body, black holes and wormholes, and other related topics; and includes a timeline.