Isaac Newton stands as one of history's most influential minds, a mathematician and physicist whose insights fundamentally reshaped our understanding of motion, gravity, and light. His groundbreaking work in the seventeenth century laid the foundation for classical mechanics and established methods of scientific inquiry that endure today. Beyond the famous apple, Newton's life was marked by intense periods of creativity, fierce intellectual rivalries, and contributions that extended into alchemy and theology—dimensions often overshadowed by his scientific legacy. Test your knowledge of the man behind the revolution.
▶ Play today's quizIn which scientific field is Isaac Newton most famous for his laws?
Source: Newton's three laws of motion and his law of universal gravitation are the cornerstone of classical physics.
According to legend, what falling object inspired Newton's gravity ideas?
Source: The apple story is real-ish: Newton said watching one fall made him wonder why it didn't go sideways or up.
Newton is credited as a co-inventor of which branch of mathematics?
Source: Newton developed calculus to handle motion, sparking a bitter priority feud with Leibniz.
Newton's first law says an object at rest tends to do what?
Source: This is inertia: things keep doing what they're doing unless a force acts on them.
Newton's masterwork is usually shortened to what one-word title?
Source: The 'Philosophiae Naturalis Principia Mathematica' is so famous it's known simply as the Principia.
Newton showed that white light is actually made of what?
Source: Using a prism, Newton split sunlight into a rainbow, proving colour was inside the light, not the glass.
At which English university did Newton spend most of his academic career?
Source: Newton studied and later held the Lucasian Professorship at Trinity College, Cambridge.
Newton's second law links force to mass and what other quantity?
Source: F = ma: the bigger the force or the smaller the mass, the greater the acceleration.
What kind of telescope did Newton famously build using mirrors?
Source: His reflecting telescope used a curved mirror instead of lenses, avoiding the colour blur of refractors.
Newton wrote his laws of motion mainly to explain the movement of what?
Source: His gravity maths finally explained why planets orbit the Sun in the ellipses Kepler had described.
What prestigious London science institution did Newton lead as president?
Source: Newton ran the Royal Society for over two decades, ruling it with a famously iron grip.
Newton had a fierce calculus priority dispute with which mathematician?
Source: Newton and Leibniz invented calculus independently, but each accused the other of stealing it.
Newton spent years running which British government institution?
Source: As Master of the Mint, Newton chased down counterfeiters and even sent some to the gallows.
Newton's law of gravity says force weakens with the square of what?
Source: Double the distance and gravity drops to a quarter: the famous inverse-square law.
Besides physics, Newton secretly devoted huge effort to which pursuit?
Source: Newton wrote more on alchemy and turning metals to gold than on the physics that made him famous.
Newton's reflecting telescope solved which flaw of earlier designs?
Source: Lenses bend colours differently, blurring images; a mirror reflects all colours the same way.
Which reigning monarch knighted Newton in 1705?
Source: Newton's 1705 knighthood was likely tied to politics, not science, granted during an election campaign.
Which colleague paid out of pocket to get Newton's Principia published?
Source: Halley, of comet fame, funded the Principia himself when the Royal Society ran out of money.
Newton's prism work founded the modern study of light known as what?
Source: His book 'Opticks' laid the foundations of the science of light, colour, and vision.
Newton's famous 'shoulders of giants' line was likely a veiled jab at whom?
Source: Hooke, Newton's rival, was notably short; many read the modest-sounding quote as a sly insult.