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The Difference Between Potential Energy and Power

Definition of over penetration as used in this article:

A projectile passes through an intended target or backstop and is still capable of causing a person serious physical energy or death.

Now That’s Power!!

SlapShot USA’s technology mitigates danger to surrounding people and property by effectively transferring energy developed within the firearm across a distance and into the target.  When a bullet passes through the intended target, only a fraction of the available energy has been transferred to the intended target. Over penetration is dangerous when it leads to energy being wasted in unintended directions and on unintended targets. With the SlapShot PHD, the risk of over penetration is reduced by rapidly dispensing the energy into the intended target. This produces an explosive pressure wave inside the target which simultaneously interrupts the function of multiple internal organs, accelerating incapacitation beyond mere blood loss. Temporary cavities 20 times larger than the projectile and crush cavities six times the diameter of the projectile are evidence of rapid energy transfer (8).


Terminal ballistics can be illustrated by comparing the difference between 500 pounds of sand and a 500-pound rock. How will each act when dropped on top of you.  Both carry the same potential energy, but their different physical structures will cause energy to be transferred differently upon impact. Your body probably would withstand the energy from the sand pile better than the energy from the rock. The rock’s physical characteristics will force the body to immediately absorb the entirety of its energy. The sand’s physical characteristics will diffuse the energy as the particles of sand are spread out allowing the body to absorb the energy at a slower rate. In the end, the difference is in how the energy is transferred into your body. The SlapShot PHD series is optimized to dump its energy rapidly, creating an explosive pressure wave.

Adam Teig

Vice President

Analytics & Design

SlapShot USA LLC

Author: Graduated Central Washington University BS Physics.

Editor’s note:

Developing the SlapShot PHD and MAPX technology is the culmination of scientific research and analysis, applied physics, and practical experience using firearms in close quarters and urban combat. Here are references to studies conducted by some of the industries brightest minds:


  1. Comments on “Ballistics: a primer for the surgeon” (Courtney and Courtney, 2008)
  2. Relative incapacitation contributions of pressure wave and wound channel in the Marshal and Sanow data set (Courtney and Courtney, 2006)
  3. Review of criticisms of ballistic pressure wave experiments, the Strasbourg goat tests and the Marshal and Sanow data (Courtney and Courtney, 2006)
  4. Experimental Observations of Incapacitation via Ballistic Pressure Wave without Wound Chanel (Courtney and Courtney, 2007)
  5. Ballistic pressure wave contributions to rapid incapacitation in the Strasbourg goat tests (Courtney and Courtney, 2007)
  6. Links between traumatic brain injury and ballistic pressure waves originating in the thoracic cavity and extremities (Brain Injury, volume 21, issue 7, June 2007)
  7. Cavitation and shock wave effects on biological systems (Bernhard Wolfrum, 2004)
  8. United States Army, Office of Medical History, Mechanism of Wounding, Chapter 3, E. Newton Harvey PhD

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