I Tried to Discover Momentum From Scratch

When you hit a cue ball on a pool table and it strikes another, one ball stops while the other suddenly takes off. What is actually happening here beneath the surface? We are often tempted to guess that total energy is the constant element in a collision, but that is only partially true and not the whole story. Because energy is a scalar—just a number without direction—it cannot tell us where the objects will go, and some of it is simply lost to heat or sound. Furthermore, looking at mass alone provides an incomplete description of the physical event. The real answer lies in what Newton originally called the "quantity of motion," or momentum. In this video, we investigate exactly what stays constant during any collision. By combining mass and velocity, and applying Newton's Third Law of equal and opposite forces, we reveal why momentum doesn't just change forms like energy, but transfers directly from one object to another. You do not need to blindly memorize the formula $p=mv$. By the end of this video, you will realize that this equation is not just a random rule, but a logical conclusion and a strict physical necessity that simply had to exist. Timestamps: 00:00 - The Pool Table Mystery 00:41 - Mass Is Constant 01:20 - Velocity Is Constant 01:34 - Movimentum 02:00 - Experimental Validation 02:18 - Why Momentum Is Conserved 03:42 - Why Not Energy Music by Vincent Rubinetti Download the music on Bandcamp: [https://vincerubinetti.bandcamp.com] Stream the music on Spotify: [https://open.spotify.com/artist/2SRhE...] About The Physics Frame: We break down complex physics and mathematical concepts into deeply intuitive, visual stories. No memorization, just pure curiosity. (Also the Hindi voice for 3Blue1Brown) #physicsfundamentals #momentum #linearmomentum #conservationofmomentum