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A wedge can be used to keep a door open. A metal wedge can be used to split logs. Most wedges are used to prevent unwanted movement, and their use is numerous.
A wedge serves as the tip of a crowbar or chisel, and in cutting implements such as knives, axes, and the blades of scissors.
1. Use a wood wedge under a door to keep it open. 2. Use a metal wedge in a wooden axe handle to keep the axe firmly attached to the axe. 3. Use a metal wedge to split logs for firewood.
The word wedge has many definitions. Since you are asking in the "Lawn and Garden Tools" section I will assume you are asking about a wedge that is used to separate two things as in chopping wood. Once a cut is made in the wood with an axe a wedge can be placed in that cut and hit with a large hammer to separate the two side of the wood.
A wedge a triangular shape, and may be of many materials. Ice-wedging is a phenomenon met in polar latitudes as a ground structure. An axe-man would use a wedge to aid in making sure a tree fell in a particular direction. In this case, the wedge would be made of wood, plastic, or aluminium, so as to not damage the saw. A wedge is one of the fundamental shapes used in the study of mechanics.