This First assumption being made for this example is that the gloves have no weight. This is not a bad assumption because compitition gloves weigh only 8 ounces and don't provide much cushoning.

In a Straight right, your punch has more force behind it than a simple jab. There is a slight forward twist of your should that adds some of your body weight behind the punch. Once again, we assume the weight of the arm is 14 lbs, or 6.5 kgs.  To this, we add 15% of the rest of the body weight, 26.5 lbs or 12kgs, for a total of 18.5kgs.

A Straight right is slower than a jab because of the added weight.. We assume the punch goes from puncher to punchie in 1/4 of a second. Since the arm travels roughly 24 inches, that means the punch is traveling roughly at a speed of 4 feet/sec or 2.4m/s.

Starting at rest and accelerating to 2.4m/s in 1/4th of a second means the arm has an acceleration if (2.4m/s - 0m/s)/.25s = 9.6m/s².

Next, if we assume that the opponents head is a stationary object absorbing all the force of the impact, The force on the opponents head can be modeled as:

    18.5kg * 9.6 m/s² = 178N

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