Momentum

Momentum (force) is produced by an object in motion. Force is equal to the product of mass of the body and its acceleration (f=mv). In a punch, the mass of the fist may not change, but the velocity of the fist is variable. If the fist constantly accelerates over the distance to the target, the final velocity will increase the striking force of the punch. The longer a force acts on an object, the greater the final velocity, so you should maintain acceleration until contact is made, do not snap back before contact. Muscles work in sequence to produce maximum power; you should start contracting each succeeding muscle the point of greatest velocity from the previous muscle. All muscle forces must be applied toward movement in one direction. The following three items describe how momentum/force is induced in an opponent.

Impulse

Stopping force is proportional to the product of the mass and velocity of the object in motion and is inversely proportional to the time required to stop the object. When this is applied to the force equation, the result is: stopping force x time = mass x velocity (ft=mv). Therefore, if the mass and velocity of a punch is constant, then a small stopping force will require more time to stop the punch and a large stopping force will require less time. The product of the time and the force required to stop the punch is called impulse.

Impulsive Force

If the time required to stop an advancing object is near zero, then the force required to stop it will nearly equal the momentum of the object. When an object is stopped in an extremely short time, the product of the force and time is called impulsive force. This occurs when a punch strikes the body or a bat strikes a ball.

Transfer of maximum force to an opponent

To transfer maximum force to an opponent, you must induce momentum in the opponent in the shortest time possible, apply all your mass into the strike, and achieve maximum velocity with the strike. This means a maximum power punch will have the weight of the body behind it, have all the muscles in the body working to accelerate it maximum velocity, and will induce momentum in the opponent in minimum time.

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