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What are the physical functions of boxing and slapping, and how to explain their principles with physics?
You can't understand the problem because you made a mistake about the contact part between the fist and the palm. Because the contact area of the palm is much smaller than that of the fist. Boxing is to hit with the fist peak, which is the front of the whole boxing. The contact part of the palm is the root of the palm.

This part is much smaller than the contact area of a fist. In this way, the same force and pressure are several times greater. So the attack power is very high. Because of the large contact area, the fist will be greatly resisted by the body. The resistance of the palm stroke will be much smaller, so the so-called penetration is produced. It will cause damage to internal organs. It's like hitting your stomach with your fist. At this time, the abdominal muscles can block most of the strength. If you attack with your palm, it will form a cutting force. Even if the abdominal muscles are strong, they will be badly hurt by this cutting force.