Reaction Force
A jet engine is pushed by the speed of the exhaust gases

Concentration
# The smaller the striking surface of the attacking tool, the greater the penetration given the same amount of energy

Equilibrium
# Loss of balance and the elevation of the center of balance will reduce the amount of energy delivered to a target

Breath Control
# Time the contraction of the muscle groups delivering the power
# Stiffen the body at the right moment to help withstand a blow
# Avoid loss of energy

Mass
# Body weight adds to the delivered energy provided all elements of T.O.P are observed

Speed
# F = M(D/T)Squared where D = distance and T = time

Speed and Reflex
# Any technique delivered faster than an opponents reaction time will strike its target without being blocked

Speed and Strength
# Application of pleiometric principles greatly enhances the energy delivered to a target

Remember:
TOP = MR.CEB3 WHERE F=M(D/T)2

(Excerpts from Taekwon-do Encyclopedia)