Newton's First Law (Law of Inertia) states that an object remains at rest or in uniform motion unless acted upon by an external force. F=ma is the Second Law, action-reaction is the Third Law, and E=mc² is Einstein's mass-energy equivalence.
Physics is the most fundamental of all the natural sciences - the ambitious, awe-inspiring discipline that seeks to understand the deepest rules governing everything that exists, from the unimaginably small quarks that make up the protons inside every atom, to the incomprehensibly vast filaments of galaxies stretching across billions of light-years of space. Physics does not merely describe the world - it reveals the hidden architecture beneath appearances, the mathematical skeleton upon which all of reality is constructed. The story of physics is also one of the great intellectual adventures in human history. In the seventeenth century, Isaac Newton looked at the fall of an apple and the orbit of the Moon and perceived the same invisible force at work - gravity - and from that insight built a complete mathematical framework that would successfully describe the motion of everything from cannonballs to planets for the next two centuries. Then, in the early twentieth century, Albert Einstein arrived and overturned Newton's picture with his theory of relativity, revealing that space and time are not fixed and absolute but flexible and interconnected - a fabric that can be warped by mass and energy. And even as Einstein was developing relativity, a revolution equally profound was unfolding in the quantum domain, where scientists discovered that at the subatomic scale, the familiar rules of everyday physics break down entirely, replaced by a strange probabilistic world in which particles can exist in multiple states simultaneously until the moment they are observed. This physics quiz tests your understanding of the fundamental concepts that form the foundation of this extraordinary science. What does Newton's First Law - the Law of Inertia - actually state, and why is it so important? What is the standard SI unit for measuring energy - and how does it relate to the everyday units we encounter in nutrition labels and electricity bills? When you stand under a clear sky and marvel at its brilliant blue color, which precise physical phenomenon is responsible for that color? What type of wave is sound - and why does this mean that sound cannot travel through the vacuum of outer space? What exactly is plasma - that fourth state of matter so unfamiliar to everyday experience, yet so dominant in the universe that it makes up the vast majority of all visible matter, including the Sun itself? Get ready to think like a physicist - with rigor, curiosity, and a willingness to see the familiar world in an entirely new light.