Wedge

Technically a portable double inclined plane, a wedge is a simple machine used to separate two objects, or portions of objects, through the application of force, perpendicular to the inclined surfaces, developed by conversion of force applied to the blunt end. The mechanical advantage of a wedge depends on the ratio of it length to its thickness.

Examples include axes and nails. Knives and chisels can sometimes be used as wedges, however, they are more fundamentally cutting implements.

In mathematics, there is something called the wedge product.

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