Problem figuring out the reflection of a pulse on a rope

[Omid]

I have problem figuring out the reflection of a pulse on a rope with a fixed point.
Do you know some websites to find animations about it?

 

[vincentchan]

http://www.kettering.edu/~drussell/Demos/reflect/reflect.html

an animation worth a thousand words

 

[Omid]

Maybe more :D

Thank you, both the animation and discription (Newton's third law) at the page were what I needed to understand it.