George Jeffreys

Humble Math PhD interested in learning science.

[George Jeffreys @GeJeffreys]

My intention for Crush AP is that colleges stop offering algebra-based physics classes because the incoming freshman already took our course.

[George Jeffreys @GeJeffreys]

Conservation of mass in action.

Rainwater flows in and gets concentrated into the river channel - more material squashed into a tighter cross-sectional area has only one escape valve: flow faster and faster.

Learn more at https://t.co/Va4tkgHyUC

[George Jeffreys @GeJeffreys]

Once a student understands physics, they often marvel at how easy it is (regardless of the time, energy, or suffering it took them to get to this point).

[George Jeffreys @GeJeffreys]

"Impulse is change in momentum"

Actually, impulse is force applied over a time interval. The connection with momentum is a nontrivial consequence of this, not a definition in-and-of itself.

Otherwise, why would we even bother giving it a name if it was just p_f - p_i?

[George Jeffreys @GeJeffreys]

3) Write down the list of equations you will potentially need to solve this problem.

4) Begin solving the problem.

This process maximizes the chances of being correct every time. If you struggle with physics, try this routine.

[George Jeffreys @GeJeffreys]

Every high school and college physics problem should be tackled in this manner:

1) Rewrite the problem statement using symbols, variables, and such, making sure to express all given quantities (knowns) and the quantity one is searching for (unknowns).

2) Draw a picture.

[George Jeffreys @GeJeffreys]

If you are taking AP Physics I, the most important single skill to practice is matching up a physics problem with the equations you'll need to solve it. Just 'what variables do they give me, what variable am I looking for, what equations match that?'

[George Jeffreys @GeJeffreys]

@AmmarMerhbi The idea that the pictures are the hard part... I could not be more shocked by this.

[George Jeffreys @GeJeffreys]

@Austen They can all do it, it's just that some of them have more creative answers than others.

[George Jeffreys @GeJeffreys]

@palan57 @MichaelPetrilli Honestly, time. When a professor writes a textbook, they go on sabbatical. Creating good course materials while teaching would be an enormous demand on a person's time. Both teaching and writing good teaching materials are too intensive to do either halfway.

[George Jeffreys @GeJeffreys]

The 2% target incentivizes people to invest wealth instead of hoarding it. This is essentially the principle that the world economy is organized around. In particular, even if you don't think it's worth it, it's baked into every financial instution. Meaning, actual deflation would cause massive problems with every single financial institution at once.

[George Jeffreys @GeJeffreys]

@turing_hamster Maybe there's a benefit to seeing a lot of other people/your peers successfully modeling the task you are also currently doing.

[George Jeffreys @GeJeffreys]

@ZyMazza Joke's on them: every ratio is between two integers.

[George Jeffreys @GeJeffreys]

@GrantSlatton I think they deliberately chose to ignore any text with a number in it (maybe with the thinking it would be a url or a proper noun or something that shouldn't be corrected). So, just don't do that and I think you'd be well on your way.

[George Jeffreys @GeJeffreys]

@JoanneLeeJacobs It's funny how counter-intuitive it all is. I mean, if you had to guess ahead of time, you would assume that leveled-reading groups would work great.

[George Jeffreys @GeJeffreys]

@def__ibrahim__ It's okay, we still have Inverse Cramer

[George Jeffreys @GeJeffreys]

@eduleadership Can't help but notice that "no late policy" and "unlimited retakes" both create an enormous amount of logistical overhead

[Greg Ashman @greg_ashman]

NEW FREE POST The journalist, the federation and the policy of 'isolation'
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[George Jeffreys @GeJeffreys]

What I would want is some kind of loose framework for a sort of explicit instruction self-study for arbitrary topics. You would never be able to do it properly, but surely it's possible to beat pure unguided reading.