Science Is Fun By Tomas Rosko on Instagram: "Here’s the physics behind it: 1. Building Centrifugal (Normal) Force As he runs in circles, their body presses outward against the wall. In physics terms, his inward acceleration (centripetal) causes an equal and opposite reaction: an outward normal force from the wall. The faster he circles, the stronger that outward push becomes. 2. Using Friction to Climb The normal force increases friction. With more outward pressure, friction gets stronger—holdin