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## #1 2012-12-09 09:12:55

Mathegocart
Member
Registered: 2012-04-29
Posts: 1,882

### 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.

The integral of hope is reality.

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## #2 2012-12-09 10:01:51

bob bundy
Registered: 2010-06-20
Posts: 8,108

### 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

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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## #3 2012-12-09 10:47:02

Mathegocart
Member
Registered: 2012-04-29
Posts: 1,882

### Re: Math Cats

Awesome.

The integral of hope is reality.

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