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Gear up Your Gear Knowledge with Gears

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Gears are fairly straightforward way to couple rotational motion, and the physics topics required to understand them are encountered in an entry level physics classroom, not a university degree. But to really dig down to the root of how gears transfer motion may be somewhat more complex than it seems. [Bartosz Ciechanowski] put together an astonishingly good interactive teaching tool on gears, covering the fundamentals of motion up through multi-stage gear trains.

Illustrating the distance traveled at different points on the disc

The post starts at the beginning – not “how to calculate a gear ratio” – but how does rotational motion work at all. The illustrations help give the reader an intuitive sense for how the rate of rotation is measured and what that measurement actually represents in the real world. From there [Bartosz] builds up to describing how two discs touching edge to edge transfer motion and the relationship of their size on that process. After explaining torque he has the fundamentals in place to describe why gears have teeth, and why they work at all.

Well written explanatory copy aside, the real joy in this post is the interactivity. Each concept is illustrated, and each illustration is interactive. Images are accompanied by a slider which lets you adjust what’s shown, either changing the speed of a rotating gear or advancing the motion of two teeth interlocking. We found that being able to move through time this way really helped form an intuitive understanding of the concepts being discussed. This feels like the dream of interactive multimedia textbooks come to life.

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JayM
2 hours ago
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Atlanta, GA
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Fruit Drops and Packet Drops

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Urban legends claim that Sir Isaac Newton started thinking about gravity when an apple dropped on his head. Regardless of its origins, his theory successfully predicted planetary motions and helped us get people to the moon… there was just this slight problem with Mercury’s precession.

Likewise, his laws of motion worked wonderfully until someone started crashing very small objects together at very high speeds, or decided to see what happens when you give electrons two slits to go through.

Then there was the tiny problem of light traveling at the same speed in all directions… even on objects moving in different directions.

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JayM
2 hours ago
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Atlanta, GA
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Doutores

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vitormazzi
2 hours ago
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Brasil
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3D Pranker

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Follow @lamebook on instagram for more content!

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dreadhead
8 hours ago
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Vancouver Island, Canada
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Not a bright idea: Ontario's new licence plates 'virtually unreadable' at night, police officer says

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Sgt Steve Koopman

Driving at night comes with challenges from poorly lit roads to headlight glare, but now many Ontarians say there’s another thing to worry about — not being able to read the province’s new licence plates in the dark. 

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dreadhead
8 hours ago
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Vancouver Island, Canada
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CRTC hearings could open door to mobile disrupters — and possibly cheaper cellphone rates

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AFP_12Z1AZ

Canadians love to talk about their cellphone bills, and today Canada's telecommunications regulator will jump into that conversation as it launches nine days of hearings.

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dreadhead
8 hours ago
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"The CWTA says Canada's existing wireless providers offer a good mix of affordable plans and reliable coverage." Good one.
Vancouver Island, Canada
DMack
7 hours ago
they've been saying exactly this same thing for over a decade now
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Information about 69,000 Phoenix pay system victims sent in error

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Privacy breach

More than 69,000 public servants caught up in the Phoenix pay system debacle are now victims of a privacy breach after their personal information was accidentally emailed to the wrong people, says Public Services and Procurement Canada.

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dreadhead
8 hours ago
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Vancouver Island, Canada
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