Moment of Inertia Explained in Simple Words for Beginners
Science ABC
Nov 10, 2025 11:00
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Chapters
What is moment of inertia? In this video, we explain moment of inertia in simple words — from the merry-go-round example (why kids sitting on the edge makes it harder to spin) to the formula I = mr², figure skaters pulling their arms in to spin faster, and real-world applications in gymnastics, cycling, cranes, and even doors. Learn why moment of inertia depends on both mass AND how far that mass is from the spinning axis.
Whether you're a physics student preparing for an exam, or curious about why spinning objects behave the way they do, this beginner-friendly animated explainer covers it all.
CHAPTERS:
WATCH NEXT:
▶ Angular Momentum Explained in Simple Words – https://youtu.be/ho3VQy4wO4E
▶ Torque Explained in Simple Words for Beginners – https://youtu.be/tsY6ae5Ryp4
▶ How Do Airplanes Fly? The Science of Flight Explained – https://youtu.be/g9oVFRG1PGQ
KEY TOPICS COVERED:
• What moment of inertia is: rotational resistance to spinning
• The formula I = mr² and why distance is squared (small changes = big impact)
• The merry-go-round analogy: mass distribution matters more than total mass
• Figure skaters, gymnasts, and divers: controlling spin speed by redistributing mass
• Bike wheels, cranes, and doors: real-world moment of inertia applications
• How moment of inertia connects to torque and angular momentum
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REFERENCES:
http://hyperphysics.phy-astr.gsu.edu/hbase/mi2.html
https://www.acs.psu.edu/drussell/bats/bat-moi-details.html
https://www.feynmanlectures.caltech.edu/I_19.html
Voice Over: John Staughton (https://www.fiverr.com/jswildwood)
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Science & Technology
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