Because they were essentially in a vacuum, there was no air resistance and the feather fell at the same rate as the hammer, as Galileo had concluded hundreds of years before – all objects released together fall at the same rate regardless of mass. Within the accuracy of the simultaneous release, the objects were observed to undergo the same acceleration and strike the lunar surface simultaneously, which was a result predicted by well‑established theory.

Galileo was the first to assert that all bodies at rest fall at the same velocity, regardless of their material, weight, and volume. Galileo argued that such an anomaly was due to the resistance of air and that, absent such a force, all falls would prove to be of equal duration. In the late seventeenth century…a vacuum was created in a glass tube…A feather and a gold coin (a guinea) placed inside the tube were dropped at the same time. The two bodies, despite their very different weights, reached the base of the tube together.

Verify that in a vacuum all objects fall with identical acceleration regardless of mass, and that air resistance, scaled by the drag‑to‑mass ratio, is the sole cause of the familiar feather‑vs‑hammer difference. Both objects land at t ≈ 2.02 s and Separation stays 0.00 m. The feather therefore lags far behind, still metres above ground when the hammer lands [in atmosphere].

During the final minutes of the third Apollo 15 moon walk, Commander David Scott performed a demonstration experiment. A heavy object (a 1.32‑kg aluminum geological hammer) and a light object (a 0.03‑kg falcon feather) were released simultaneously from approximately the same height (~1.6 m) and allowed to fall to the lunar surface. Within the accuracy of the simultaneous release, the objects were observed to undergo the same acceleration and strike the lunar surface simultaneously, a result predicted by well‑established theory that all objects released together fall at the same rate regardless of mass in a vacuum.

In a famous demonstration, Galileo supposedly dropped a heavy weight and a light weight from the top of the Leaning Tower of Pisa to show that both weights fall at the same acceleration. However, this rule is true only if there is no air resistance. This demonstration lets you repeat Galileo’s experiment in a vacuum…Notice that the feather falls much more rapidly than before — in fact, it falls almost as fast as the coin.

The force of attraction on the hammer is proportional to the mass of the hammer, but the acceleration of the hammer when allowed to fall in a vacuum is inversely proportional to its mass (Newton's 2nd Law) so the mass of the hammer cancels and the result is that a hammer, and a feather, and anything else in a vacuum at the Earth's surface, will accelerate at the same rate, namely about 9.8 m·s⁻². In other words, the hammer and the feather both accelerate toward Earth at the same rate. The reason that the hammer and the feather fall at the same rate (at least, within the range of human perception) is because the earth is so huge compared to the difference in mass between the hammer and the feather that we cannot detect the difference between the rate that they fall.

Galileo once proposed that all objects under gravity, whether they’re really heavy or really light, will fall and accelerate downwards at the same rate. A vacuum chamber will suck out some air, creating less air resistance. The less air there is, the closer their rate of falling is. If you had no air at all, if you could truly get gravity to be the sole factor, then you could call the object being in free-fall…For this reason, the feather experiment was re-created on the Moon by astronaut David Scott using a feather and a hammer.

Subtract the atmosphere, however, and we can easily confirm Galileo’s hypothesis that any two objects, regardless of weight, shape, or material of composition, will fall at exactly the same rate when dropped. One of the most memorable times this experiment did take place was…on the Moon, when astronaut David Scott…dropped a geologic hammer and a falcon’s feather at the same time in 1971. The principle Galileo was realizing is that mass (and size) don’t matter. They all have the same rate of falling in vacuum (when there’s no air to slow them down).

In a vacuum both objects will land at the same time regardless of their masses. This happens because there is no drag in a vacuum and the acceleration due to gravity is the same for all objects. So both will fall with the same acceleration, which is 9.81 m/s² on the earth, and reach the ground together.

At NASA’s Space Power Facility — the world’s largest vacuum chamber — scientists proved a mind‑blowing principle: Without air resistance, all objects fall at the same rate — no matter their weight. [Demonstration video shows a bowling ball and feathers dropped together in a vacuum chamber and hitting the ground at the same time, confirming equal acceleration in vacuum.]

In the latest episode of ‘Human Universe’ Professor Brian Cox tested the laws of gravity at NASA’s Space Power Facility near Cleveland, Ohio, the world’s biggest vacuum chamber. Almost all of the air is removed from the chamber to make it a vacuum; then a bowling ball and feathers are raised and dropped from a height. The objects are then dropped and hit the ground at the same time because there is no air resistance and they fall at the same rate, illustrating that in the absence of air both fall at the same rate owing to the laws of gravity, just as with the Apollo 15 feather‑and‑hammer demonstration on the Moon.

At the end of the last Apollo 15 moon walk, Commander David Scott performed a live demonstration for television cameras in which he held out a geologic hammer and a feather and dropped them at the same time. Because they were essentially in a vacuum on the Moon, there was no air resistance and the feather fell at the same rate as the hammer. Scott’s narration at about 1:04 in the video states that this "proves that Mr. Galileo was correct" in his findings about falling bodies.

This document discusses Galileo’s law of falling bodies, which states that in a vacuum all objects fall with the same constant acceleration regardless of their mass or composition. It describes how Galileo demonstrated this by dropping objects like hammers and feathers simultaneously from the Leaning Tower of Pisa and later from the moon, finding they hit the ground at the same time. It states, "All body fall with the same constant acceleration in a vacuum."

Almost 2,000 years later, Galileo proved that heavy objects and light objects fall to Earth at exactly the same rate. Similarly, if you pump all of the air out of a glass chamber to create a vacuum, you can drop both the feather and the bowling ball — no strings attached — and watch them hit the ground at the exact same time. The feather‑bowling ball duo doesn't fall at a slower rate because the feather is lighter than just the bowling ball alone — instead, they both fall at exactly the same rate.

Description: Feather, penny, a piece of paper all fall at the same rate when the chamber is evacuated. Instructions: Show how objects fall at different rates, then evacuate chamber with vacuum pump for approximately 2 minutes, close chamber valve, disconnect hose and show objects falling again. This free‑fall in a vacuum demonstration is used in physics teaching to show that when air is removed from the chamber, different objects (including a feather) dropped from the same height fall at the same rate.

In a vacuum chamber, a feather and metal balls are dropped to see how gravity acts without air. The presenter notes that with no air in the chamber, the feather and the metal balls are "falling exactly the same speed". They explain that outside the chamber air is what causes the feather to fall slower, whereas inside the evacuated chamber the acceleration due to gravity is a constant for all the objects.

On August 2, 1971, Commander Scott of Apollo 15 demonstrated that in a vacuum, all bodies fall at the same rate, confirming Galileo’s principle. He used a hammer and a bird feather to illustrate this concept. The principle showcased was that the force of gravity acted equally on both objects.

The moon has very little air in its atmosphere, so there was no air resistance and the feather fell at the same rate as the hammer, just as Galileo had concluded hundreds of years before. In a vacuum, all objects fall at the same rate regardless of mass. [Description of the Apollo 15 hammer‑feather drop explains that both objects, released together on the Moon, hit the ground at the same time.]

This classroom gravity demonstration shows a feather and a coin dropped in a long vacuum chamber. The narration explains that the acceleration due to gravity does not depend on the mass of the object and that the only reason a feather and a hammer fall at different rates in air is because of the air around them. When air is removed, both objects fall together and hit the ground at the same time, illustrating that in a vacuum they have the same acceleration and fall at the same rate regardless of their mass.

The Mythbusters team repeat the famous hammer‑and‑feather drop in a NASA vacuum chamber. At atmospheric pressure, when the hammer and feather are dropped at the same time, the hammer hits first while the feather glides down and hits last, showing the effect of air resistance. After the air is removed to a partial vacuum (~10⁻⁶ torr, similar to lunar conditions), they repeat the drop and observe that when there is no air resistance or drag, all objects are equally affected by gravity and fall at the same rate, with the hammer and feather hitting the ground at the same time.

Because they were essentially in a vacuum, there was no air resistance and the feather fell at the same rate as the hammer, as Galileo had concluded hundreds of years before – all objects released together fall at the same rate regardless of mass.

Watch as both the feather and the metal fall at the same rate, clearly demonstrating that in a vacuum, all objects experience the same acceleration due to gravity. If you suck all of the air out of the room, everything will hit the ground at the same time — even something really heavy like a spaceship and a penny. [The video recreates feather‑and‑metal drops in a vacuum to show simultaneous impact.]

In this educational video, a setup in a vacuum chamber is used to compare the fall of different objects. It states that because they were essentially in a vacuum, with no air resistance, a hammer and a feather "fell at about the same rate", confirming Galileo’s conclusion that all objects released at the same time fall at the same rate regardless of mass in a vacuum. The experiment suspends objects at the top of the vacuum chamber using magnets, removes air, and then releases them to show they fall together.

A physics lecture-demonstration description notes that the Apollo 15 astronaut’s hammer/feather drop "shows that all objects fall at the same rate regardless of mass, added by the fact that the moon has no air to cause resistance with the feather." It also points out that both objects fall more slowly than on Earth because lunar gravity is about one sixth of Earth’s, but their equal fall rate demonstrates the absence of air resistance in the lunar environment.

Gravity will pull all objects down at the same rate. If you have a giant vacuum on earth, the hammer and feather both drop at the same speed. Without an atmosphere all objects will fall at the same speed because gravity acts on both objects equally. All else being equal, this means that all objects dropped from the same height will fall at exactly the same rate, regardless of how heavy they are.

The Apollo 15 astronauts famously dropped a feather and a hammer on the Moon and they hit the ground at the same time, thus proving Galileo’s theory. In this vacuum‑chamber experiment, the presenter first drops a feather and a piece of metal in air, then removes the air and repeats the drop. The experiment "proves that gravity pulls on everything with the same acceleration" and demonstrates that in a vacuum a feather and a metal object fall at the same speed and hit the bottom together.

The reason for this simultaneous impact lies in the principle of gravitational acceleration. Regardless of their masses, all objects experience the same acceleration due to gravity in a vacuum, leading to equal fall times when released from the same height. While the amount of force a hammer experiences is greater than what a feather experiences, the increased force experienced by the hammer is offset exactly by the larger inertia of the hammer, so the two objects end up accelerating at exactly the same rate.

A space history discussion explains that during the Apollo 15 mission, Commander Dave Scott dropped a geology hammer and a falcon feather simultaneously and "they both hit the ground at the same time." The post states that this showed that "in a vacuum objects of different masses fall at the same rate," and that the demonstration helped confirm Galileo’s theory about falling bodies.

Another commentary on the Apollo 15 feather/hammer drop notes that on Apollo 15 David Scott dropped a hammer and a falcon feather on the Moon. With no air to slow the feather, both hit the ground together, thereby demonstrating that in the near‑vacuum conditions on the lunar surface, objects of different mass fall at the same rate under gravity when air resistance is negligible.

In a vacuum (with no air resistance), all objects fall at the same rate regardless of their mass. A feather and a bowling ball accelerate downward at exactly 9.8 m/s² on Earth. In everyday life, feathers fall slower than hammers because air resistance affects them differently.

In this physics experiment, a vacuum chamber is used to test gravity on different objects including a feather and a hammer. The description explains that as air resistance is removed by creating a vacuum, both the feather and the hammer are dropped simultaneously, and slow‑motion footage shows that gravity pulls both objects toward the ground at the same rate regardless of their differing weights. The video explicitly aims to replicate the classic NASA Apollo lunar gravity experiment showing equal free‑fall acceleration in a vacuum.

A Reddit thread discussing the Apollo 15 hammer and feather drop links to video of the event and describes how it illustrates Galileo’s principle. One commenter notes that the same effect can be reproduced on Earth "by making a simple vacuum," implying that when air resistance is removed, objects such as a hammer and feather dropped from the same height fall together and land at the same time regardless of their mass.

When there’s no air resistance or drag, all objects are equally affected by gravity and fall at the same rate. So, I should be able to put these in the vacuum and see them both hit the ground at the same time if it is a true vacuum…When there’s no air resistance or drag, all objects are equally affected by gravity and fall at the same rate, and we do indeed have a vacuum.

The answer is: in a vacuum, both fall at the same rate because there is no air resistance, and gravity accelerates all objects equally. [Explanation contrasts this with motion in air, where the feather is slowed much more by drag and therefore takes longer to reach the ground.]

This article from a Japanese tech/news site reports on a gravity test in the world’s largest vacuum chamber. It describes a feather and a steel ball "falling side by side as if synchronized" and notes that they "fall to the ground at the same time" once the air has been evacuated. The piece explains that without air, a feather really does fall at the same speed as a heavy metal ball, visually confirming equal fall times in a vacuum.

A video page hosting the Apollo 15 hammer‑feather drop shows Commander David Scott holding a geologic hammer and a feather and dropping them simultaneously on the Moon. The description reiterates that because they were essentially in a vacuum, there was no air resistance and the feather fell at the same rate as the hammer, demonstrating that all objects released together fall at the same rate independent of mass when air resistance is absent.