Van 3's Comments
"pushing hands" is different than kicking someone across the room. It is possible using certain stances to redirect the force exerted upon the pusher (for lack of a better term) be the person being pushed down the legs of the pusher, thus causing the force of the normal to increase significantly.
This, however, has a very low rate of energy release and can't really compare to a punch or kick, where the force is rapidly exerted - at least not where forces strong enough to impart enough energy in an instant to hurl someone across a room are concerned. Bare in mind that pushing someone across a room involves the constant impartation of energy to the person being pushed. A punch or kick would require all of that energy (plus the energy to get the target off the ground) to be imparted all at once, since the point of contact is very brief.
I'm not arguing that this stuff doesn't look great on screen, btw...it's just not possible as it's portrayed.
This, however, has a very low rate of energy release and can't really compare to a punch or kick, where the force is rapidly exerted - at least not where forces strong enough to impart enough energy in an instant to hurl someone across a room are concerned. Bare in mind that pushing someone across a room involves the constant impartation of energy to the person being pushed. A punch or kick would require all of that energy (plus the energy to get the target off the ground) to be imparted all at once, since the point of contact is very brief.
I'm not arguing that this stuff doesn't look great on screen, btw...it's just not possible as it's portrayed.
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Well, for that kung fu kick to work, the friction of the one grounded foot would have to exceed the force exerted upon the kicker by the target (which of course would be equal to the force exerted on the target by the kicker) so that the normal exerted upon the kicker by the ground would allow the kicker to remain stationary. Given even ground, the normal couldn't exceed the force of gravity upon the kicker, and given that the vector of the force exerted upon the target would be near perpendicular to the normal, and the force exerted upon the target would have to be SIGNIFICANTLY higher than the pull of gravity upon the target (due to the fact that the force in the upward vector alone has to exceed the pull of gravity in order for the target to become airborne at all and the majority of the force would be on the horizontal vector), the mass of the kicker would have to GREATLY exceed the mass of the target for the kicker to remain effectively stationary.
That is, of course, if the kicker is on the ground. If the kicker is airborne (as he/she always seems to be) then no amount of physics could reasonably why he/she remains stationary.
Given these basic principles of physics, the only "footing" where this would be possible is with the grounded foot butted against a nearly vertical surface (such as a wall as suggested by Rule #4).
I may have missed something, but I should be pretty close.
Sorry, just the way the universe is my friend.
That is, of course, if the kicker is on the ground. If the kicker is airborne (as he/she always seems to be) then no amount of physics could reasonably why he/she remains stationary.
Given these basic principles of physics, the only "footing" where this would be possible is with the grounded foot butted against a nearly vertical surface (such as a wall as suggested by Rule #4).
I may have missed something, but I should be pretty close.
Sorry, just the way the universe is my friend.
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Maybe they should hire "Physics Consultants" the same way that they hire "Wardrobe Consultants"? Not likely, but we can all dream.