The force is applied in a different direction to that in which movement takes place. The steepness of the inclined plane is a key factor. If a person uses a longer board to make the inclined plane, he or she will need less force to move the object up the ramp. A double wedge is made up of two inclined planes back to back. You find a double wedge on an axe blade.
Single wedges resemble an inclined plane, because they have only one sloping surface.
A doorstop is a single wedge. Remember that the inclined plane does not move. Pushing one under an object provides a space for your fingers. The longer the wedge and the smaller the angle of slope, the less the force needed, but the wedge must be pushed in a greater distance. Wedges can also be used to tighten or hold things in place, for example, a wedge peg to hold a bench together, or a doorstop Wedges are mostly used to push things apart, for example, pounding a nail into a block of wood.