work (mechanics)

Presents a children's book for early readers that describes how different machines are used to make work much easier.

Examines various mainstream and alternative sources of energy, and imagines what life would be like without electricity.

Explores the relationship between work and energy, looks at the difference between potential and kinetic energy, examines forms of kinetic energy and NASA's dependence on solar energy, reviews the three laws of thermodynamics, and discusses different types of energy exchanges, the history of car design, and how cars convert potential energy into motion.