SIO424: Semen Caught Violating Newton's 3rd Law? (the one about cum)
Feb 1, 2024
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Astrophysicist Dr. Bryan Gillis returns to discuss a quirky topic - sperm violating Newton's 3rd Law. They dive into the amusing scenario of a sperm mug shot, explore contra positives in logic with animal classification, and analyze the implications of violating Newton's 3rd Law on fundamental physics. The podcast delves into semen viscosity, sperm physics modeling, and challenges traditional physics assumptions in a fun and informative way.
The study introduces odd elasticity to model sperm tail motion, simplifying calculations by allowing violations of Newton's third law.
Abstract quantities known as PCA modes characterize the predictable wavelike movement of sperm tails.
Deep dives
Modeling Sperm Tail Motion
The study explores the motion of sperm tails by modeling them as a chain of springs connected to individual points. By allowing violations of Newton's third law, the tail can maintain a periodic motion that mimics its actual movement. This modified model, known as odd elasticity, simplifies calculations without increasing complexity.
Abstract Representation of Patterns
Abstract quantities known as PCA modes characterize the motion pattern of sperm tails. These repeating modes result in a cyclic motion displayed in illustrations that showcase the tail's complex but predictable wavelike movement over time.
Using Simplified Physics Calculations
The study acknowledges that real-world scenarios involve multiple complexities like reactive forces from the environment, which are often ignored for the sake of simplification in physics calculations. This intentional violation of Newton's third law allows for practical modeling without significant computational burden.
Applying Physics Principles to Abstract Models
The abstract representation of sperm tail motion through PCA modes and odd elasticity demonstrates how physics principles can be applied to complex biological structures. The study navigates between practical simplifications and theoretical violations to effectively model natural phenomena.
Astrophysicist Dr. Bryan Gillis is back! And here's here to talk about... sperm? Well, when a science headline claims that sperm is violating Newton's 3rd Law, that's when the science police have to lay down the law, no matter how weird the topic. But before you think this is just a bad journalist, the paper may actually be where the problem is... Bryan explains the whole damn thing.