Within Falling Objects
Try the falling object myth for yourself
Simple drop tests can show when mass matters less than air resistance, as long as the examples are chosen carefully.
On this page
- Safe comparisons that isolate mass
- Paper shape tests that reveal drag
- Mistakes that make the myth look true again
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Introduction
The quickest way to correct the “heavier objects fall faster” intuition is not to memorise a rule but to test it. Simple home experiments show that two different ideas are often being mixed together: gravity pulling objects down, and air resistance slowing them down. When people compare a stone with a feather, they are usually comparing both mass and drag at the same time. A better test changes one factor while keeping the others as similar as possible. NASA’s educational material on free fall emphasises that, in the absence of air resistance, objects fall with the same acceleration regardless of mass. [NASA]www1.grc.nasa.govIn a vacuum, a beach ball falls at the same rate as an airlinerNASAFree Fall without Air Resistance | Glenn Research Center18 Jul 2024 — All objects, regardless of size or shape or weight, free fall w…
The most useful home demonstrations are not the dramatic ones. They are the comparisons that make it obvious when shape matters more than weight and when the myth seems true again because the test was poorly controlled.
Safe comparisons that isolate mass
A good test tries to change mass without changing shape very much. That is harder than it sounds.
One simple method is to use two balls of similar size but different mass. A rubber ball and a steel ball of roughly the same diameter work better than comparing a ball with a sheet of paper. When dropped from the same height at the same moment, they should reach the ground almost together. Any difference is usually too small to see without slow-motion video. This is because the objects have similar shapes and similar amounts of drag relative to their size. [The Physics Classroom]physicsclassroom.comSubsequently, all objects free fall at the same rate…Read more…
Another classic test uses two identical sheets of paper and a heavy book:
- Drop the book and one sheet of paper separately.
- The paper falls much more slowly.
- Now place the paper flat on top of the book and drop them together.
The paper stays close to the book and reaches the floor at nearly the same time. The important point is not that the book “carries” the paper downward. The book blocks much of the air flow that would normally push against the paper. The result exposes air resistance as the missing factor. Educational physics demonstrations frequently use this setup because it isolates drag without requiring special equipment. [Fizzics Education]fizzicseducation.com.auFizzics EducationBook drop gravity activityTest how gravity works in this classic book drop activity! You can explore one of the fundamen…
If you want more reliable results, record the drop with a smartphone in slow-motion mode. Human reaction time is often too slow to judge small differences between falling objects.
Why coin-versus-feather is a misleading test
People often reach for the most extreme comparison available: a heavy coin and a light feather.
The problem is that this test changes almost everything at once. The objects differ in mass, shape, density, stiffness and surface area. If the feather loses, you cannot tell which factor mattered most. The experiment confirms ordinary experience but does not identify the cause. Physics education research repeatedly finds that such everyday observations reinforce the heavier-falls-faster belief because the role of air resistance remains hidden. [PMC]pmc.ncbi.nlm.nih.govPMCAn understanding of falling bodies across schoolingPMCby P Potvin · 2023 · Cited by 8 — Developing a graphical tool for students to understand air resistance and free fall: when heavier ob…
Paper shape tests that reveal drag
Paper experiments are among the best home demonstrations because they keep mass constant while changing shape.
Take two identical sheets of paper:
- Leave one flat.
- Crumple the other into a tight ball.
- Drop them together from the same height.
The crumpled paper usually reaches the ground first. Yet both pieces contain exactly the same amount of paper and therefore the same mass. What changed was the surface area exposed to the air. The flat sheet traps and pushes more air as it falls, producing much greater drag. [Ask About Ireland]askaboutireland.ieAsk About IrelandSame weight but different shapeThe flat piece falls more slowly because it has a larger area than the crumpled piece. So… [Ingrid Science]ingridscience.caAir resistanceEffectively demonstrate air resistance by dropping two paper plates, one flat and one crumpled. Or drop different weights a…
This experiment is powerful because it directly challenges the intuition that weight alone determines falling speed. The heavier-falls-faster explanation cannot work here because neither object is heavier.
A useful extension is to create several versions:
- Flat sheet [* Loosely crumpled sheet]marlingtonlocal.orgFPS_ESS Investigations.bookThe crumpled paper has the same weight as the flat sheet of paper. What is… Challenge: Calculate the number… [* Tightly crumpled sheet]marlingtonlocal.orgFPS_ESS Investigations.bookThe crumpled paper has the same weight as the flat sheet of paper. What is… Challenge: Calculate the number…
You will usually see a progression. The tighter the crumpling, the faster the fall. That gradual change helps replace the simple myth with a condition-based rule: drag becomes more important when an object presents a large area to the air. [Ask About Ireland]askaboutireland.ieAsk About IrelandSame weight but different shapeThe flat piece falls more slowly because it has a larger area than the crumpled piece. So…
Coffee filters and paper rotors
Coffee filters provide another easy demonstration. Drop one filter, then stack two or three together and drop them. The extra mass changes the motion, but not in the simplistic way many people expect. The filters accelerate until air resistance grows large enough to balance their weight, creating a terminal velocity. Educational activities often use coffee filters to explore this balance between gravity and drag. [PBS LearningMedia]pbslearningmedia.orgPBS LearningMediaTerminal Velocity Activity using Coffee Filters | Images of the…During this activity, your students will use coffee f…
Paper “whirlybirds” or paper helicopters make the same lesson visible in a different form. Changing the rotor size changes how much air the device pushes against, which alters how slowly it descends. These designs show that falling speed can depend strongly on interaction with air rather than on weight alone. [Science Buddies]sciencebuddies.orgScience BuddiesMake a Whirlybird from Paper | STEM ActivityJun 25, 2020 — This hands-on lesson offers a fun opportunity to explore "invis…
Mistakes that make the myth look true again
Many home tests accidentally recreate the conditions that support the misconception.
One common mistake is comparing objects with very different shapes. A tennis ball and a sheet of paper do not provide evidence about mass because drag differs enormously between them.
Another mistake is dropping objects from too low a height. If the fall lasts only a fraction of a second, it becomes difficult to judge whether the objects really separated or merely appeared to. Slow-motion recording can help here.
A third mistake is releasing objects unevenly. If one object leaves your hand a fraction of a second before the other, the result may look like a physics effect when it is actually a timing error.
There is also a subtler problem: sometimes heavier objects really do fall faster in air. Physics Classroom notes that more massive objects can outperform lighter ones when air resistance is appreciable. The key point is that the cause is not a special gravitational advantage. The heavier object may simply be less affected by the same drag force. [The Physics Classroom]physicsclassroom.comSubsequently, all objects free fall at the same rate…Read more…
This is why careful demonstrations matter. The goal is not to replace one absolute statement with another. It is to learn when mass matters little, when air resistance dominates, and how to tell the difference.
What result should convince you?
A successful home experiment does not prove that air resistance never matters. It proves that the everyday rule “heavier objects always fall faster” is too simple.
The strongest demonstrations are usually the ones where mass stays the same and shape changes. Watching a flat sheet of paper and a crumpled version of the same sheet land at different times makes it difficult to keep blaming weight. Once that result is clear, the broader idea becomes easier to accept: gravity pulls all falling objects downward, but what you actually observe depends on how much the air interferes with that motion. [Ask About Ireland]askaboutireland.ieAsk About IrelandSame weight but different shapeThe flat piece falls more slowly because it has a larger area than the crumpled piece. So… [NASA]science.nasa.govthe apollo 15 hammer feather dropApollo 15 Hammer-Feather Drop20 Jul 2015 — A live demonstration for the television cameras. He held out a geologic hammer and a feather a…
Amazon book picks
Further Reading
Books and field guides related to Try the falling object myth for yourself. Use these as the next step if you want deeper reading beyond the article.
Six Easy Pieces
First published 1994. Subjects: Physics, Física, Obras de divulgación, Natuurkunde, Long Now Manual for Civilization.
Physics for Future Presidents
First published 2008. Subjects: Social aspects, Physics, Science and state, Popular works, Science in mass media.
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Endnotes
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Source: www1.grc.nasa.gov
Title: In a vacuum, a beach ball falls at the same rate as an airliner
Link: https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/free-fall-without-air-resistance/Source snippet
NASAFree Fall without Air Resistance | Glenn Research Center18 Jul 2024 — All objects, regardless of size or shape or weight, free fall w...
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Source: pmc.ncbi.nlm.nih.gov
Title: PMCAn understanding of falling bodies across schooling
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC10249391/Source snippet
PMCby P Potvin · 2023 · Cited by 8 — Developing a graphical tool for students to understand air resistance and free fall: when heavier ob...
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Source: science.nasa.gov
Title: the apollo 15 hammer feather drop
Link: https://science.nasa.gov/resource/the-apollo-15-hammer-feather-drop/Source snippet
Apollo 15 Hammer-Feather Drop20 Jul 2015 — A live demonstration for the television cameras. He held out a geologic hammer and a feather a...
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Source: grc.nasa.gov
Link: https://www.grc.nasa.gov/www/k-12/VirtualAero/BottleRocket/airplane/falling.htmlSource snippet
Object with Air ResistanceAn object that is falling through the atmosphere is subjected to two external forces. The first force is the gr...
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Source: physicsclassroom.com
Link: https://www.physicsclassroom.com/class/1DKin/Lesson-5/The-Big-MisconceptionSource snippet
Subsequently, all objects free fall at the same rate...Read more...
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Source: fizzicseducation.com.au
Link: https://www.fizzicseducation.com.au/150-science-experiments/force-movement-experiments/book-drop-gravity-activity/?srsltid=AfmBOoppxjH7C2PW6neXn3PX9yvssvv_HiyJLO0HJtRKjTZSQfydakQQSource snippet
Fizzics EducationBook drop gravity activityTest how gravity works in this classic book drop activity! You can explore one of the fundamen...
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Source: askaboutireland.ie
Link: https://www.askaboutireland.ie/learning-zone/primary-students/5th-%2B-6th-class/science/gravity/some-ideas-about-gravity/same-weight-but-different/Source snippet
Ask About IrelandSame weight but different shapeThe flat piece falls more slowly because it has a larger area than the crumpled piece. So...
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Source: ingridscience.ca
Link: https://www.ingridscience.ca/node/402Source snippet
Air resistanceEffectively demonstrate air resistance by dropping two paper plates, one flat and one crumpled. Or drop different weights a...
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Source: pbslearningmedia.org
Link: https://www.pbslearningmedia.org/resource/6f1c4669-3018-440b-bfad-c3fc93b1efb5/images-of-the-past-terminal-velocity-coffee-filter/Source snippet
PBS LearningMediaTerminal Velocity Activity using Coffee Filters | Images of the...During this activity, your students will use coffee f...
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Source: sciencebuddies.org
Link: https://www.sciencebuddies.org/stem-activities/whirlybirdSource snippet
Science BuddiesMake a Whirlybird from Paper | STEM ActivityJun 25, 2020 — This hands-on lesson offers a fun opportunity to explore "invis...
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Source: physicsclassroom.com
Title: Free Fall
Link: https://www.physicsclassroom.com/Teacher-Toolkits/Free-Fall/Free-Fall-Complete-ToolKitSource snippet
The model...Read more...
Additional References
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Source: aps.org
Link: https://www.aps.org/learning-resources/falling-physicsSource snippet
American Physical SocietyFalling PhysicsFree Fall Fall Air Resistance. This simulation allows students to compare the motion of free fall...
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Source: reddit.com
Link: https://www.reddit.com/r/AskPhysics/comments/1hhds0q/eli5_why_dont_larger_objects_fall_faster/Source snippet
ELI5, why don't larger objects fall faster?: r/AskPhysicsYou've misunderstood the question. Extremely massive objects will fall faster b...
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Source: marlingtonlocal.org
Link: https://www.marlingtonlocal.org/Downloads/FPSESS_INV_EBOOK.pdfSource snippet
FPS_ESS Investigations.bookThe crumpled paper has the same weight as the flat sheet of paper. What is... Challenge: Calculate the number...
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Source: creativescience.com.au
Link: https://www.creativescience.com.au/wp-content/uploads/2019/07/hammer_and_feather.pdfSource snippet
Hammer and FeatherHeavier objects push against air with more force than lighter objects, so heavier objects tend to fall faster than ligh...
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Source: doi.org
Link: https://doi.org/10.1063/9780735420571_008Source snippet
Inertia and Gravitational ForceAgree that air friction dominates here. Compare the falling rate of a crumpled sheet of paper with a whole...
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Source: stem.org.uk
Link: https://www.stem.org.uk/resources/library/resource/26368/the-hammer-and-the-feather-on-the-moonSource snippet
The hammer and the feather on the MoonThis classic Apollo 15 clip, from Footagevault, demonstrates that the mass of an object does not af...
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Source: spark.iop.org
Link: https://spark.iop.org/many-students-think-heavier-object-will-fall-faster-lighter-one-same-general-shape-or-sizeSource snippet
This resource will challenge the common mistaken idea that heavier objects fall faster than lighter objects. View Resource.Read more...
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Source: askfilo.com
Title: learning area lesson no learning activity sheet force motion 3432373036373738
Link: https://askfilo.com/user-question-answers-smart-solutions/learning-area-lesson-no-learning-activity-sheet-force-motion-3432373036373738Source snippet
Lesson No.: LEARNING ACTIVITY SHEET Force, Motion, and26 Nov 2025 — Air Resistance: Slows down objects with a larger surface area (like f...
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Source: brilliant.org
Link: https://brilliant.org/wiki/do-heavier-objects-fall-faster-than-lighter/Source snippet
Why some people say it's true: If a feather and an egg are dropped, then the egg will reach the ground first.Read more...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=O-KYLXp2MG4Source snippet
How to Demonstrate Air Resistance | Science ProjectsTry really big sheets of paper, try really small sheets of paper and ultimately you'r...
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