Author Archives: e=mc2andallthat

About e=mc2andallthat

Gethyn Jones BSc, PGCE, MCCT is a physics teacher of over 29 years experience who still enjoys teaching (well, most of the time anyway). He lives in London with his lovely wife and two rescue cats. Please follow him on Twitter @emc2andallthat

Circuit Diagrams: Lost in Rotation…?

Originally posted on e=mc2andallthat:
Is there a better way of presenting circuit diagrams to our students that will aid their understanding of potential difference? I think that, possibly, there may be. (Note: circuit diagrams produced using the excellent…

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Signposting Fleming’s Left Hand and Right Hand Rules

Originally posted on e=mc2andallthat:
Students undoubtedly find electromagnetism tricky, especially at GCSE. I have found it helpful to start with the F = BIl formula. Introducing the “magnetic Bill” formula This means that we can use the streamlined…

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Why we wrote ‘Cracking Key Concepts in Secondary Science’

Originally posted on e=mc2andallthat:
From the Introduction “We strongly believe that the central part of any science lesson or learning sequence is a well-crafted and executed explanation. But we are also aware that many – if not most…

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From the Earth to the Sun in 270 BC

Originally posted on e=mc2andallthat:
The sun is only 32 miles across and not more than 3000 miles from the Earth. It stands to reason it must be so. God made the sun to light the earth, and therefore…

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From the Earth to the Moon in 270 BC

Originally posted on e=mc2andallthat:
The brain is wider than the sky, For, put them side by side, The one the other will include With ease, and you beside. Emily Dickinson How did human beings first work out the…

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Measuring the radius of the Earth in 240 BC

Originally posted on e=mc2andallthat:
The brain is wider than the sky, For, put them side by side, The one the other will include With ease, and you beside. Emily Dickinson, ‘The Brain’ Most science teachers find that ‘Space’…

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Binding energy: the pool table analogy

Originally posted on e=mc2andallthat:
Nuclear binding energy and binding energy per nucleon are difficult concepts for A-level physics students to grasp. I have found the ‘pool table analogy’ that follows helpful for students to wrap their heads around…

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Visualising How Transformers Work

Originally posted on e=mc2andallthat:
‘Transformers’ is one of the trickier topics to teach for GCSE Physics and GCSE Combined Science. I am not going to dive into the scientific principles underlying electromagnetic induction here (although you could read…

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A Gnome-inal Value for ‘g’

Originally posted on e=mc2andallthat:
The Gnome Experiment Kit from precision scale manufacturers Kern and Sohn. . . . setting storms and billows at defiance, and visiting the remotest parts of the terraqueous globe. Samuel Johnson, The Rambler, 17…

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Nature Abhors A Change In Flux

Originally posted on e=mc2andallthat:
Aristotle memorably said that Nature abhors a vacuum: in other words. he thought that a region of space entirely devoid of matter, including air, was logically impossible. Aristotle turned out to be wrong in…

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