Physicists Break Down the Newest Sports for Paris 2024

Angular Momentum

Angular momentum and torque are pivotal in sports like breakdancing and BMX, where athletes perform complex rotations. Nikita Ducarroz explains that these sports involve rigid body rotation, where different body parts rotate around each other, creating a net effect of motion 1. Neil deGrasse Tyson highlights the importance of understanding angular momentum, which is akin to momentum in linear motion, but for rotation 1. Charles Liu adds that athletes must manage these forces to execute moves like the "freeze," where they abruptly stop their rotation, transferring momentum back to the Earth 2.

The amount of energy that goes into stopping your body from full speed, that's a lot.

--- Charles Liu

This intricate balance of forces is what makes these sports both challenging and fascinating to watch.

   

Lever Mechanics

Lever mechanics are crucial in sports for enhancing performance and efficiency. Gary O’Reilly notes that athletes often rely on intuitive motion, adjusting their moves in real-time to match the music or situation 3. Nikita Ducarroz explains that torque can be generated with minimal force by using lever arms, similar to stopping a door from slamming by applying force near the doorknob 3. Different types of levers, such as those used in scissors or brooms, demonstrate how varying fulcrum positions can optimize force application 4.

Give me a long enough lever and I shall move the world.

--- Nikita Ducarroz

This principle allows athletes to maximize their energy output with strategic positioning and movement.

   

Historical Analogies

Historical analogies, like the Tennis Racket Theorem, help explain the physics in modern sports. Nikita Ducarroz describes how objects with different shapes and moments of inertia react when spun, using the example of a tennis racket that flips when spun in a certain way 5. Neil deGrasse Tyson recalls demonstrating this concept with a book, illustrating the intermediate axis theorem, which shows how an object's rotation can become unstable 5. This understanding of rotational dynamics provides a deeper appreciation for the complexity of athletic movements.

You spin it in the third direction in that intermediate direction, and it will always do a flip.

--- Nikita Ducarroz

Such insights reveal the intricate physics behind seemingly simple actions in sports.