PHYSICS TEACHING / SCIENTIST BIOGRAPHY
[Scientist Biography Series] Aristotle: Learn Philosophy, and You Can Learn Anything
Aristotle’s physical theories were revised one by one, but the truly interesting part is seeing how he tried to build an explanation for the entire world before knowledge had been divided into modern disciplines.
This article follows Aristotle’s life and intellectual choices: from Plato’s Academy to a wide-ranging system of his own, then into the elements, natural motion, and the unmoved mover. It asks why theories that now appear incorrect can still matter in the history of science.
- From Stagira to Plato’s Academy
- Family background, education, and disagreements between teacher and student
- Different approaches to Forms, substances, matter, and form
- Teaching, career, and interdisciplinary work
- Tutoring the future Alexander the Great
- Writing across philosophy, physics, biology, and politics
- Aristotle’s ancient view of physics
- Four terrestrial elements and the celestial aether
- Natural motion, falling bodies, and the unmoved mover
- How to evaluate theories that were later revised
- Separating modern scientific accuracy from historical influence
- Seeing how knowledge can advance through correction
Aristotle (Aristotélēs, 384–322 BCE) was an ancient Greek philosopher. Together with his teacher Plato and Plato’s teacher Socrates, he is regarded as one of the central figures in the history of ancient Greek philosophy.
Although he was a philosopher, Aristotle wrote extensively across many fields. In earlier periods of Western history, philosophers and scientists were not separated in the way they are today. His work covered metaphysics, physics, biology, music, and even politics.
Taken together, Aristotle’s works almost form an encyclopedia of the ancient Greek world. Some have even described him as one of the last people of his age to master nearly every field of knowledge. His writings profoundly influenced the development of Western science and thought.
Background
Aristotle was born in 384 BCE in Stagira, a city in northern Greece. His father was physician to the king of Macedon, so Aristotle came from a well-connected family and had access to a good education.
Education
At the age of eighteen, Aristotle was sent to study at Plato’s Academy, where he received Plato’s instruction.
Aristotle was highly intelligent and quick-minded, but over time he developed views that differed from Plato’s on many important questions. Judging from the works he left behind, he was clearly not the kind of student who accepted everything his teacher said.
Their views diverged especially in ontology—the question of what most fundamentally exists in the world.
In a highly simplified comparison, Plato placed greater emphasis on Forms that transcend particular things, whereas Aristotle paid closer attention to the individual things we encounter. This is only a teaching shorthand, however. Strictly speaking, Aristotle was not a materialist in the modern sense; he understood concrete things as composites of matter and form.
Take a chair as an example. Plato would direct attention to the Form or Idea shared by individual chairs. Aristotle would begin with the concrete chair before us and ask what material it is made from, what form it has, and why it counts as a chair. This is still a simplified illustration, but it comes closer to the original philosophical problem than merely contrasting “concept first” with “object first.”
Later writers often condensed Aristotle’s attitude into the line, “Plato is dear to me, but truth is dearer.” This is not a verbatim sentence from the Nicomachean Ethics, but it does capture the point he makes there: friends and truth are both precious, yet philosophers must give priority to truth.
Aristotle, however, did not simply stand on the side of what we would now call materialism. He rejected the idea that Forms exist entirely apart from concrete things, while also treating form, purpose, and causation as indispensable to understanding nature. Rather than wavering between idealism and materialism, he constructed a different explanatory system of his own.
Teaching and Research
After Plato’s death, Aristotle was invited by Philip II of Macedon in 342 BCE to tutor the fourteen-year-old prince at court. That prince would later inherit the throne as Alexander the Great.
After Alexander became king, Aristotle returned to Athens and established a school. Alongside teaching, he wrote extensively on science, philosophy, politics, and other subjects.
At this point, a few of Aristotle’s best-known theories are worth mentioning.
To explain the composition of matter, Aristotle proposed a system of five elements. He placed Earth at the center of the cosmos and held that terrestrial matter was composed of four elements: earth, air, fire, and water. A fifth element, aether, was the divine substance of the heavenly bodies.
In physics, Aristotle’s theory of natural motion held that the speed of a falling body in a medium depended on its weight and the resistance of that medium; under otherwise similar conditions, a heavier body would fall faster. Galileo later challenged this account through thought experiments, studies of motion, and mathematical reasoning. Modern mechanics went on to build a more complete description of free fall. For a fuller discussion, see “[Scientist Biography Series] Galileo: His Life and Free Fall.”
For moving bodies, Aristotle believed that motion required explanation through a mover. But tracing every mover back to an earlier mover raises the question of whether the chain of causes can continue indefinitely, so he proposed an “unmoved mover.” Later Jewish, Islamic, and Christian philosophers incorporated this concept into arguments about God in different ways. Those are later theological interpretations and should not be treated as identical to Aristotle’s original theory.
Aristotle’s natural philosophy later became an important foundation of European academic education. Challenging his theory of motion therefore meant more than offering a different answer—it meant confronting an established framework of knowledge. Modern mechanics eventually supplied a different account of continuing motion through inertia: an object does not need a continuous push to remain in uniform motion. The controversies Galileo faced were one part of this long transformation in knowledge.
Conclusion
From these examples, we can see that many of Aristotle’s theories in physics and chemistry were incorrect—and, from a modern point of view, some can appear quite absurd.
Even so, under conditions where measurement was imprecise and much of the natural world remained unknown, the ideas and conceptual systems Aristotle proposed were remarkably valuable. Come on—if you had lived then, could you really have thought of that much? XD
Beyond physics and chemistry, Aristotle’s ideas in philosophy and politics deeply influenced the later development of Western civilization. His work is often cast as the opposing side in stories about scientific progress, but its contribution to the development of Western thought remains impossible to deny.
References
Wikipedia—Aristotle, URL: http://zh.wikipedia.org/wiki/%E4%BA%9A%E9%87%8C%E6%96%AF%E5%A4%9A%E5%BE%B7
Science Hall of Fame—Aristotle, URL: http://www.bud.org.tw/museum/s_star19.htm
Aristotle, URL: http://163.20.156.1/~97st10/newfile_13.html
Aristotle—Stanford Encyclopedia of Philosophy, URL: https://plato.stanford.edu/entries/aristotle/
Form vs. Matter—Stanford Encyclopedia of Philosophy, URL: https://plato.stanford.edu/entries/form-matter/
Aristotle’s Metaphysics—Stanford Encyclopedia of Philosophy, URL: https://plato.stanford.edu/entries/aristotle-metaphysics/
Nicomachean Ethics, Book I, Chapter 6, URL: https://people.bu.edu/wwildman/courses/wphil/readings/wphil_rdg09_nichomacheanethics_entire.htm
Aristotle—Internet Encyclopedia of Philosophy, URL: https://iep.utm.edu/aristotle/
Galileo Galilei—Stanford Encyclopedia of Philosophy, URL: https://plato.stanford.edu/entries/galileo/
Ancient Greek Philosophy—Internet Encyclopedia of Philosophy, URL: https://iep.utm.edu/ancient-greek-philosophy/
Natural Philosophy in the Renaissance—Stanford Encyclopedia of Philosophy, URL: https://plato.stanford.edu/entries/natphil-ren/
FAQ
No. Ancient fields of knowledge were not divided as they are today. His work also covered logic, natural philosophy, biology, ethics, politics, and rhetoric, so by modern classifications he addressed many questions we would call scientific.
His theory of natural motion linked the speed of a falling object to its weight and to the surrounding medium. Modern mechanics later replaced that account with a more precise experimental and mathematical description.
The fifth element was aether, which Aristotle associated with the heavens. Terrestrial matter was described through earth, water, air, and fire.
The history of science is not only a list of today’s correct answers. It also shows how people framed questions, proposed explanations, and revised them with new evidence and methods. Aristotle’s influence offers an unusually complete example of that process.
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