Physics is the fundamental science that explains how our universe works, from the smallest atoms to the largest stars.

Classical Physics: The Study of Large Objects

Classical Physics deals with objects that we can see and touch. It follows rules established by scientists like Isaac Newton. This branch explains how a ball moves when you throw it or how a car speeds up on a road. A core part of this is Mechanics, which uses formulas like F = ma (Force equals mass times acceleration) to predict motion. Other parts include Thermodynamics, which studies heat and energy, and Electromagnetism, which explains how electricity and magnets work.

Modern Physics: The World of the Tiny

Modern Physics began in the early 20th century, specifically around 1905 with Albert Einstein. It studies things that are incredibly small, like atoms, or incredibly fast, like light. Because these objects behave differently than large things, they need new rules. Quantum Mechanics is a key field here; it explains how subatomic particles like electrons can exist in two places at once. Another field is Relativity, which explains how time slows down when you travel close to the speed of light, which is approximately 300,000 kilometers per second.

The Scope of Physics

• Astrophysics: This branch studies the life cycles of stars, planets, and galaxies. For example, it explains why the sun produces light through a process called nuclear fusion.
• Optics: This is the study of light. It explains how lenses in glasses bend light to help us see clearly.
• Nuclear Physics: This focuses on the nucleus of an atom. It is the science behind how nuclear power plants generate electricity using uranium atoms.

By dividing physics into these branches, scientists can focus on specific puzzles to solve. Whether it is the orbit of a planet or the vibration of an atom, every branch uses the scientific method to uncover the truth about nature.