Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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bob bundy wrote:

Hi MathsIsFun,

This page looks excellent to me. Had to cover a physics lesson once, so, instead of copying from books, I got out the Van de Graaff generator. The effect on washed, fine hair is 'shocking!'.

Bob

Pics please

bobbym wrote:

It might take an individual electron more than a month to make the trip due to innumerable collisions.

I should mention that!

**MathsIsFun**- Replies: 10

A new page: Electricity

Please check it over for accuracy, etc!

Compuhigh.com have asked that we remove this topic "in order to ameliorate the harm to later students who may find the question and answer in an internet search".

I have responded to them "I am awaiting permission from two forum members ... seems a shame as the student was very engaged in the process and learned a lot with members help, as would others visiting the page. There are likely to be many places on the internet (facebook, reddit, etc) where your students will find answers to previous questions, it seems easier to simply change your questions (even a little) every year."

Ignoring many arguments (and a heavy heart), it simply seems like a nice gesture to Compuhigh to remove it.

With your permission anonimnystefy and bob?

Thanks everyone!

I will leave the page as it is until I can think of a way to simplify it without straying into "y=2x+3 becomes y=(x-3)/2" territory.

The "graphing calculator" reasoning might be why Wolfram (ie Mathematica) uses f-¹(x)

Thanks Guys!

I found Wolfram uses f-¹(x): http://mathworld.wolfram.com/InverseFunction.html

It would be nice to simplify the page to f-¹(x) ... but in the intro I say "So the inverse of: 2x+3 is: (y-3)/2" and that does not sit well with using f-¹(x)

Nor with the table of inverses as ganesh mentions.

**MathsIsFun**- Replies: 10

On this page: Inverse Functions

I have f(x) becoming f-¹(y)

But a reader has suggested it should be f-¹(x)

It would certainly be simpler not swapping y for x. What is correct do you think?

bobbym wrote:

... and since I have no spoon that shiny ...

I polished it specially for the occasion!

I will mention The law of reflection, thanks ganesh.

**MathsIsFun**- Replies: 3

Another one for comments/suggestions: Reflection

Thanks everyone! Excellent hearing, bobbym.

You may be in Internet Explorer, bob, it does not have a thing called "AudioContext" so my code doesn't make any sound.

**MathsIsFun**- Replies: 6

Another in the Waves series: Sound Waves

Let me know any Suggestions and Comments

Thanks!

**MathsIsFun**- Replies: 4

A new page for you guys to review: Introduction to Waves

(I have been working on a lot of pages on waves, this is the first.)

Comments, suggestions please.

Thanks bobby and ganesh.

And bobby: the Romans were just that good. Great roads, too. But apart from concrete and roads what have they ever done for us?

**MathsIsFun**- Replies: 3

Another page for everyone to check out: Types of Force

Comments/suggestions welcome

Thanks guys!

**MathsIsFun**- Replies: 4

A new page for you guys to comment on: Potential and Kinetic Energy

**MathsIsFun**- Replies: 3

A new page for you guys to review: Energy and Work

**MathsIsFun**- Replies: 5

Have a try of this little Prime Numbers Activity and tell me what you think!

Updated Gravity Freeplay with an edit option, how is it?

**MathsIsFun**- Replies: 7

A new page on Gravity

Would value your feedback.

Any ideas on how to best present space-time curvature will be welcome!

Also help in tightening up the wording is welcome, too.