The Secret Behind Newton’s Apple: The Beginning of Gravity and Modern Physics

Hey timeline kin, This is the story of Isaac Newton’s discoveries — including the law of gravity, calculus, and the famous apple moment that changed science forever. Newton was the scientist who formulated the law of gravity and explained how it works.

It begins on a quiet winter day in 1665, when a young man of twenty-three walks alone across the fields near the village of Woolsthorpe in Lincolnshire. The plague has closed Cambridge University, so he has returned to his family farm. He carries no books, no instruments — just his thoughts. Suddenly, he notices an apple fall from a tree. Most people would see nothing more than fruit dropping to the ground. But this young man sees something else. He begins to wonder: why does the apple fall straight down? This question would eventually lead Isaac Newton to become the scientist who discovered gravity and explained how it works.

That single moment of quiet curiosity would reshape humanity’s understanding of the universe.

Isaac Newton’s Miracle Year (1665–1666): Discovery of Gravity, Calculus, and Optics

When the plague forced Cambridge to close, Newton returned home for nearly two years. Working alone in isolation, he produced ideas that would dominate science for the next 200 years. In that short time, he developed the foundations of calculus, discovered that white light is a mixture of all colors by passing sunlight through a prism, and began to formulate his three laws of motion and the law of universal gravitation.

Professor, Rivalries & Isaac Newton’s Principia (1687): Laws of Motion and Universal Gravitation Explained

Newton became Lucasian Professor of Mathematics at Cambridge at the age of twenty-six. He was a terrible lecturer — students often skipped his classes. He preferred to work alone in his rooms, surrounded by notebooks and experiments.

In 1687, he published Philosophiæ Naturalis Principia Mathematica, usually called the Principia. It is widely considered one of the most important scientific works ever written. In it, Newton laid out his three laws of motion and the universal law of gravitation, showing that the same force governs both an apple falling and planets orbiting the Sun. Edmond Halley played a crucial role in persuading Newton to publish the work.

Later Life – Mint, Politics & Feuds (1687–1727)

After the Principia, Newton’s life changed. He became involved in politics, serving as a Member of Parliament for Cambridge. In 1696, he was appointed Warden (later Master) of the Royal Mint, where he vigorously pursued counterfeiters and helped reform Britain’s currency.

He also became President of the Royal Society in 1703 and held the position until his death. His later years were marked by bitter priority disputes, especially with Gottfried Wilhelm Leibniz over who invented calculus first. Newton could be both a brilliant visionary and an intensely difficult man.

He never married and had few close friends. He was deeply religious, wrote more on theology and biblical chronology than on science, and spent years trying to decode hidden messages in the Bible.

He died on March 20, 1727 (March 31 by the modern calendar) at the age of 84. He was buried in Westminster Abbey with full honors.

What Did Isaac Newton Discover?

• Law of Gravity — explains why objects fall and why planets orbit the Sun.
• Three Laws of Motion — the foundation of classical physics
• Calculus — a new mathematical system for dealing with change and motion
• Optics — discovery that white light contains all colors of the spectrum

Newton’s Legacy: Why His Discoveries Still Matter Today

Isaac Newton was not known for his personality—he was secretive, intense, and often difficult. Yet his intellectual legacy is unmatched. Through his laws of motion and universal gravitation, Newton created the foundation of classical physics, influencing science, engineering, and technology for over 300 years.
His discoveries laid the foundation for modern physics, later expanded by scientists like Einstein.

Today, every falling object, every orbiting satellite, and every space mission still follows the same physical principles Newton described. His work transformed how humanity understands the universe—proving that the same natural laws govern both Earth and the cosmos.
Do you think the world would have changed as much if Newton had never published his work?

• Who was Isaac Newton?
  Isaac Newton was an English mathematician and physicist who discovered gravity and developed the laws of motion, shaping modern science.
• What did Isaac Newton discover?
  Newton discovered the law of universal gravitation, the three laws of motion, and made key contributions to calculus and optics.
• Did Isaac Newton really discover gravity from an apple?
  The apple story is partly true. Newton said observing a falling apple inspired his ideas about gravity, but it was not a sudden discovery.
• What is Philosophiæ Naturalis Principia Mathematica?
  It is Newton’s 1687 book explaining gravity and motion, considered one of the most important works in the history of science.
• Why is Isaac Newton important today?
  Newton’s theories are still used in physics, engineering, and space technology, including satellites and modern scientific calculations.

Write whatever is on your mind below. I read every word.
Books that shaped how I see Isaac Newton:

• Never at Rest by Richard S. Westfall (the definitive modern biography)
• Isaac Newton by James Gleick (concise, elegant, and insightful)
• The Newton Papers by Sarah Dry (focus on his private writings)
• Newton and the Counterfeiter by Thomas Levenson (his work at the Mint)
• The Principia by Isaac Newton (translated editions with commentary)

Reliable sources I leaned on for key facts:

• The Newton Project – University of Oxford
• Cambridge University Library – Newton Papers
• Britannica – Isaac Newton
• Stanford Encyclopedia of Philosophy – Newton
• Royal Society – Newton Archives

If you enjoyed this fascinating look at the story of Isaac Newton and his famous apple, you may also like these related articles on the Scientific Revolution and great scientific minds:

• Gottfried Wilhelm Leibniz: The Genius Who Invented Calculus and Predicted Modern Computing — Newton’s great rival and co-inventor of calculus, another towering figure of the Scientific Revolution.
• Edmond Halley’s Greatest Discovery: The First Predicted Comet in History — Halley, Newton’s close friend and colleague, who made one of the most famous scientific predictions in history.
• How Electricity Conquered the Night and Changed Human Civilization — The scientific breakthroughs that followed Newton’s era and powered the modern world.
• From Sputnik to Starlink: The Complete History of Satellites and the New Space Age — How the laws of motion discovered by Newton became the foundation of space exploration.
• What If Computers Never Existed? The Untold Drama Behind the Machine That Rewrote Reality — How Newton’s mathematical and scientific thinking helped lay the groundwork for the digital age.
• The Iron Roads: How Trains Reshaped Time, Space, and Society — The technological revolutions that built upon the scientific principles Newton helped establish.