A wedge is a simple tool in the shape of a triangle. In other words, a wedge is simply two inclined planes back to back. Figure 1 shows the simple formulas for calculating the IMAs of these machines. The mechanical advantage formula for a wedge is dependent on its geometry:
MA of a wedge = L / t
Wedge can be used to split an object into two parts or to lift heavy objects. Knives and axe heads are examples of wedges.