Except in this case the simplified lesson is misleading and damaging. Students leave that lesson and, unlike physics, believe that’s how the real world works.
It is how the world works, on a very basic level. And friction is just as much a part of real-world physical interactions as anything else. Hell, barrier to entry, second-to-market advantage, market inertia and similar concepts are less important to most people than friction and normal tensions are.
Except in this case the simplified lesson is misleading and damaging. Students leave that lesson and, unlike physics, believe that’s how the real world works.
It is how the world works, on a very basic level. And friction is just as much a part of real-world physical interactions as anything else. Hell, barrier to entry, second-to-market advantage, market inertia and similar concepts are less important to most people than friction and normal tensions are.