lifting and carrying

Explains in basic terms the physical principles behind levers and shows with diagrams how several examples work, including wrenches, pliers, bolt cutters, and levers in machines such as tractors and bicycles.

An introduction to levers that describes their parts, functions, uses, and history.

Introduces young readers to levers, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.

Text and pictures introduce the lever, a simple machine used to change force and motion.

Demonstrates a variety of techniques used to move heavy objects.

Teaches children what levers are, how they work, and what they are used for in everyday life.

Simple English and Arabic text describe the different things people carry around the world and how they carry them.

Describes simples machines which utilize the principle of levers to move heavy objects, cut material, and make music.