wedges

Describes work, machines, inclined planes, gravity and friction, and wedges in everyday surroundings, and presents experiments that explain how they work.

Illustrations and easy-to-follow text teach early readers about wedges and ramps, what they are used for, and how they work.

Text and pictures introduce the wedge, a simple machine placed between objects to split, tighten, or secure a hold.

An exploration of wedges that defines what they are; discusses their parts, how they work, their history, and how they are used; and includes a related experiment.

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

Explains what wedges are and how they work and uses simple experiments to help students understand their applications in everyday life.

Text and illustrations describe wedges, a simple machine.

Presents an introduction to ramps and wedges, in simple text with illustrations, describing how these simple machines work in everyday life.

Uses a variety of examples, from scissors and axes to zippers and hairpin turns, to demonstrate the power of the inclined plane and show how ramps and wedges make work and play easier.

Text and pictures introduce the wedge, a simple machine used primarily to split objects.