Chapter 5, Problem 9RQ

To determine

The advantage in rolling with the punch.

Answer to Problem 9RQ

The advantage in rolling with the punch is that, it increases the time of contact of hand with the face and decreases the force, which further result into less injury.

Explanation of Solution

Impulse is a physical quantity that is dependent on two more physical quantities, force and time of duration. When the same amount of force is exerted for a greater amount of time, it will produce a greater impulse and will result in a greater change in momentum.

The meaning of the phrase, “roll with the punch” means that moving the head in the direction of the punch. So, by leaning the head in the direction of the punch increases the time interval of the interaction. This results in a smaller impact of force on the face, which further reduces the chances of injury. So, it is quite advantageous to move the head along with the punch.

Conclusion:

Therefore, the advantage in rolling with the punch is that, it increases the time of contact of hand with the face and decreases the force, which further result into less injury.