the axe is an example of a simple machine, as it is a type of wedge, or dual inclined plane. this reduces the effort needed by the wood chopper. it splits the wood into two parts by the pressure concentration at the blade. the handle of the axe also acts as a lever allowing the user to increase the force at the cutting edge—not using the full length of the handle is known as choking the axe. for fine chopping using a side axe this sometimes is a positive effect, but for felling with a double bitted axe it reduces efficiency.