{"id":53204,"date":"2025-09-26T05:16:01","date_gmt":"2025-09-25T20:16:01","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=53204"},"modified":"2026-01-20T05:01:45","modified_gmt":"2026-01-19T20:01:45","slug":"nasas-experiment-a-feather-and-a-steel-ball-fall-together-why-do-they-drop-at-the-same-time-galileos-astonishing-law-of-falling","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=53204&lang=en","title":{"rendered":"NASA Proves It! A Feather and a Steel Ball Fall Together \u2014 Why Do They Hit the Ground at the Same Time? Galileo\u2019s Astonishing Law of Falling"},"content":{"rendered":"

I am Ken Kuwako, your science trainer. Every day is an experiment.<\/strong><\/span><\/p>\n

Have you ever fumbled your smartphone and watched it slip through your fingers? In that split second of panic, a grand set of rules governing the entire universe<\/strong> is actually at work. Isn’t that exciting? We\u2019ve all heard the legend of Isaac Newton discovering gravity after watching an apple fall from a tree. Even today, the simple, everyday phenomenon of things falling is packed with enough drama to leave us in awe.Time for a quick quiz: If you drop a sheet of paper and a heavy rock at the same time, which one hits the ground first? “The heavy rock, obviously!<\/strong>” If that was your first thought, welcome to the fascinating world of physics!Actually, that bit of common sense can be flipped on its head like magic under the right conditions. Today, I want to take you on a journey into the hidden mysteries of science: the world of falling motion.<\/p>\n

Question Everything! Galileo and the Mystery of Falling<\/strong><\/h3>\n

Over 400 years ago, the great scientist Galileo Galilei had the same question you just answered. For nearly 2,000 years, people had blindly followed Aristotle\u2019s teaching that heavier objects fall faster.But Galileo thought for himself. He hypothesized: “If there were no air to get in the way, every object should fall at exactly the same speed, regardless of its weight.<\/strong>” To prove this intuition, legend has it he dropped two spheres of different masses from the Leaning Tower of Pisa to shock the onlookers. (While some say this was actually a thought experiment, the excitement of the idea remains the same!)”Wait a second,” you might say. “If I drop a feather and a ball right now, the ball definitely hits first!”You\u2019re absolutely right. That is because of air resistance<\/strong>\u2014an invisible brake. A light feather gets tossed around by air molecules, while a heavy ball cuts right through them. But what happens if we take the air away?<\/p>\n

NASA Proves It! In a Vacuum, Feathers and Bowling Balls Fall Together<\/strong><\/h3>\n

\"\"The BBC recently teamed up with NASA to perform a dream experiment in a massive facility. The stage was the world\u2019s largest vacuum chamber\u2014a room where every single molecule of air is sucked out to create a void just like the surface of the Moon.First, they dropped a bowling ball and some feathers with air in the room. Naturally, the ball crashed down while the feathers drifted slowly. But after running the pumps for hours to create a giant vacuum<\/strong>, they dropped them again, and then…\"\"<\/p>\n

Source: BBC TWO<\/a><\/p>\n

https:\/\/youtu.be\/E43-CfukEgs?si=FcopVUJoByNEwj0QThe sight is unbelievable. The light, fluffy feathers and the heavy bowling ball fall in perfect synchronization, hitting the floor at the exact same moment.<\/strong> It is a stunning moment where the truth written in physics textbooks\u2014that all objects accelerate equally\u2014manifests right before your eyes. Now, let\u2019s use the magic language of mathematics to decode the secrets of this beautiful falling motion.<\/p>\n

Adventure with Math! Decoding the 2 Main Patterns of Falling<\/strong><\/h3>\n

Falling happens because Earth\u2019s gravity is constantly pulling on an object. As it falls, its speed increases at a steady rate. This rate of speeding up is called gravitational acceleration<\/strong>, represented by the symbol $g$. On Earth, it\u2019s approximately $9.8 \\text{ m\/s}^2$. This means that for every second that passes, the object gets $9.8 \\text{ m\/s}$ faster. If you know this rule, you can predict the future speed and distance of any falling object just by calculating!<\/p>\n

Pattern 1: Free Fall (Gently Letting Go)<\/strong><\/h4>\n

This is the simplest form of falling: just opening your hand and letting an object drop. The key is that the initial velocity ($v_0$) is 0. For example, if you drop a small ball from a tall tree and it hits the ground in exactly 2.0 seconds, how high is that tree?<\/p>\n

\"Screen<\/a><\/p>\n

We use the formula for distance. By plugging in $t=2.0$ seconds and $g=9.8 \\text{ m\/s}^2$, we get:<\/p>\n

\"Screen<\/a><\/p>\n

\"\"The tree is about 20 meters tall! That\u2019s roughly the height of a 5 or 6-story building.<\/p>\n

Pattern 2: Vertical Throw-Down (Throwing with Force)<\/strong><\/h4>\n

Next is when you throw something downward with a bit of a “oomph.” If you throw a ball downward with an initial speed of $5.0 \\text{ m\/s}$, what will its speed and distance be after 2.0 seconds?<\/p>\n

\"Screen<\/a><\/p>\n

This time, the initial speed of $5.0 \\text{ m\/s}$ gives it a head start. First, let\u2019s calculate the final speed after 2.0 seconds.\"\"If you convert this to km\/h, it\u2019s about 90 km\/h\u2014as fast as a car on a highway! Now, let\u2019s look at how far it traveled in those 2.0 seconds.\"\"It traveled 30 meters, which is 10 meters further than if you had just dropped it. Using math like this allows us to visualize these physical phenomena with incredible precision.By the way, did you know that NASA experiment took 3 hours just to pump the air out of the chamber? I have so much respect for that kind of dedication to scientific truth. You should also check out the footage from the Apollo mission where they actually performed the “hammer and feather” experiment on the Moon!https:\/\/phys-edu.net\/wp\/?p=33844<\/p>\n

Inquiries and Requests<\/strong><\/h3>\n

Let\u2019s make the wonders of science a part of your daily life! I share fun experiments you can do at home and tips that make every day more interesting through the lens of science.Learn more about me, Ken Kuwako, here<\/a>.For inquiries regarding writing, lectures, science workshops, or TV consultation, click here<\/a>.Check out my latest updates on X (formerly Twitter)<\/a>!<\/p>\n

\"\"<\/a>Explore more experiments on my Science Channel!<\/a><\/p>\n

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