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

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## #1 2012-12-10 08:12:55

mathgogocart
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### Math Cats

On math Cats theres lots of interactive stuff
but this is my fav.
http://www.mathcats.com/explore/encyclo/encyclogram.html
its really fun.

bbcode;.Uhhhhhhhhh im bored.
"Those who feed spambots are spambot conspiarators,and bad people." mathgogocart.

## #2 2012-12-10 09:01:51

bob bundy
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### Re: Math Cats

hi mathgogocart

Thanks for the link; that's a great site.

Way, way back when I did A level physics I learnt about lissajous figures.  We had a double pendulum (imagine a kid's swing with another smaller one attached below it but swinging at 90 degrees to the first.  Below pendulum two was a leaky sandbag so that as each pendulum was set swinging the resultant trace of the trail of sand was a lissajous figure.

I thought that was quite fun.  But then the dark ages passed and they invented computers.    And I wrote a 10 line BASIC program to make the figures with the two rates of swing as independent variables.  It was for a competition where you had to make a program that did something useful in 10 lines.  (I didn't win because I was the teacher, setting up the task,  and it was my demo)

Basically you just need two sine curves, one for the x coordinate and a different one for the y coordinate.

Bob

You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

## #3 2012-12-10 09:47:02

mathgogocart
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### Re: Math Cats

Awesome.

bbcode;.Uhhhhhhhhh im bored.
"Those who feed spambots are spambot conspiarators,and bad people." mathgogocart.

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