How simple machines work

Introduces the science of how pulleys work and describes different kinds of pulleys and the jobs they do.

Introduces the science of inclined planes, including ramps, wedges, and screws, describing different kinds, how they work, and jobs that they perform.

Introduces the science of how levers work and describes different kinds of levers and the jobs they do.

Introduces the science of how wheels and axles work and describes different kinds of wheels and the use of wheels throughout history.

Introduces the science of how wheels and axles work and describes different kinds of wheels and the use of wheels throughout history.

Introduces the science of inclined planes, including ramps, wedges, and screws, describing different kinds, how they work, and jobs that they perform.

Introduces the science of how pulleys work and describes different kinds of pulleys and the jobs they do.

Introduces the science of how levers work and describes different kinds of levers and the jobs they do.