When discussing the penetrating ability of a hunting arrow, the two most commonly referred to factors are kinetic energy and momentum.
The term kinetic energy is derived from the Greek word for motion, kinesis, and the Greek word for active work, energeia. Thus, the term kinetic energy means “through motion, do active work.” Energy can exist in many forms, and each form of energy can often be converted to other forms. When it comes to bows, energy is stored in the limbs and cams when the bow is drawn, then transferred to the arrow shaft at the shot in the form of kinetic energy, or K.E.
Because the speed of the shaft is reduced due to both gravity and air resistance, K.E. changes along the flight path. Thus, the K.E.…