Why is a spring like a simple machine? What forces do you need for a spring to change shape? How do springs store energy? Look at everything from historical exa

A hands-on approach introduces young scientists to pulleys. Science theory and practical, fun projects teach the physics and the technology behind this simple m

Making Machines with Ramps and Wedges looks at everything from ramps and wedges in history, such as stone axes, to the role of these simple machines in more com

A hands-on approach introduces young scientists to the lever. Science theory and practical, fun projects teach the physics and the technology behind this simple

"Simple Machines! introduces kids to the concept of mechanical advantage and harnesses kid-power by inviting them to build machines of their own design. This bo