It's impossible to imagine a scenario where physics "doesn't exist" because physics is the fundamental description of how the universe operates. It's like asking what would happen if math didn't exist – it's the language we use to understand and describe reality.

However, we can explore what would happen if the laws of physics as we understand them were fundamentally different or nonexistent:

* No stable structures: Without physical laws governing matter and energy, atoms, stars, planets, and even you and I wouldn't be able to exist. There would be no consistent structure, no predictable behavior.

* No cause and effect: If there are no laws dictating how things interact, there would be no connection between actions and their results. Cause and effect is the basis of our understanding of the world.

* Chaos reigns: Without the laws of physics, the universe would be a random, chaotic mess. Everything would be in constant flux, with no order or predictability.

* No possibility of observation or measurement: The scientific method relies on the predictability of the natural world. If there were no consistent laws, we wouldn't be able to observe, measure, or even make predictions about anything.

* No meaning or purpose: The laws of physics, along with the principles of evolution and natural selection, have helped us understand our place in the universe. Without them, the universe would be devoid of meaning or purpose.

In essence, if physics didn't exist, the universe as we know it would be impossible. There would be no matter, no energy, no stars, no planets, and certainly no life.

It's important to remember that our understanding of physics is constantly evolving. We may discover new laws or even change the way we understand existing ones. However, even with these advancements, the fundamental concept of physics – the study of the universe's fundamental laws – will always be essential for our understanding of reality.