What is the definition of a wedge?

A wedge is defined as a device that has a thick end opposite a thinner end. This shape allows the wedge to exert force downward and outward when driven into an object, effectively splitting or lifting it. By converting a force applied to the thicker end into a perpendicular force along the surface of the wedge, it enables tasks such as splitting wood, lifting heavy materials, or even fastening items together through the wedging action. Its unique geometry makes the wedge a fundamental simple machine, utilized across various applications in everyday tools and construction.

The other options describe different tools or machines: compressing objects pertains more to presses or clamps, fastening objects refers to mechanisms like screws or bolts, and lifting heavy weights relates to devices such as levers or pulleys. Thus, the specific characteristic of a wedge as having a thick end and a thin end aligns perfectly with its functional definition.