Holly Holm's knockout kick hit Ronda Rousey's head with 50 pounds of force during UFC 193

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UFC Women's Bantamweight Champion Holly Holm and Ronda Rousey are two amazing fighters, and they put on a fantastic match at UFC 193, with Holm coming out as the victor.

The finishing blow was a clean kick to the head by Holm on the former champion, which knocked her out to the canvas and called an end to the fight.

This was the first time Rousey had lost a fight in the UFC division, but how hard did the knockout kick by Holm hit Rousey's head to end the fight?


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WiredScience has managed to work out the velocity, speed, and force of the kick through several different physics equations. From watching a video of the knockout kick, they managed to measure the following trajectories in the graph seen below to calculate the velocity vector, recoil velocity and the speed of the foot.

They also used another video from above the fight and The Momentum Principle to measure the impact time of the hit and with all this together, they measured the average force exerted.

If you're into your physics, then it's definitely worth a read, but like me, if you can't get a grasp of equations and you want the cheat sheet for the answers, then here they are. The speed was 14mph (6.3 m/s), the velocity vector was (-5.85,2.39,0) m/s and the recoil velocity was (-1.26,-1.04,0) m/s.

Using the next video and The Momentum Principle, they worked out the impact time was around 0.066 seconds, and the average force exerted was 50 pounds, which is around 22.7kg.

This was only the average force, meaning the peak force could've been a lot harder. Either way, it was enough to knock Rousey out.

Rousey isn't expected to fight again until UFC 200, and whether or not this will be a rematch for the UFC Women's Bantamweight Champion is unclear. At least she knows how hard of a hit it takes to knock her out.

Ronda Rousey

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