have been building Pinewood Derby cars from a block of wood, four wheels, and nails used for axles. In that time over 100 million Pinewood Derby Car kits have been sold. The race is an event ...

What is a wheel and axle mechanism? A wheel and axle mechanism is a simple device you make when you connect one or more wheels to an axle. They are used to help things move. A wheel is a round ...

The most notable of these are known as the "six simple machines": the wheel and axle, the lever, the inclined plane, the pulley, the screw, and the wedge, although the latter three are actually ...