# Friction equation for Verlet intergration..?

**URL:** <https://forum.kirupa.com/t/friction-equation-for-verlet-intergration/280362>\
**Category:** flash\
**Created:** [January 26, 2009, 7:02pm UTC](https://forum.kirupa.com/t/friction-equation-for-verlet-intergration/280362 "2009-01-26T19:02:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dandylion13](https://avatars.discourse-cdn.com/v4/letter/d/c89c15/32.png) [@dandylion13](https://forum.kirupa.com/u/dandylion13)\
**Post date:** [January 26, 2009, 7:02pm UTC](https://forum.kirupa.com/t/friction-equation-for-verlet-intergration/280362/1 "2009-01-26T19:02:47Z")

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Hi,

I have a very basic question. What the best way to calculate friction in an ENTER\_FRAME event that moves an objecct using Verlet integration?

For example:

\_temporaryX = x;  
\_temporaryY = y;  
\_vx = x - \_oldX;  
\_vy = y - \_oldY;

\_frictionX = ???;  
\_frictionY = ???;

x += \_vx + \_accelerationX + \_frictionX;  
y += \_vy + \_accelerationY + \_frictionY;  
\_oldX = \_temporaryX;  
\_oldY = \_temporaryY;

Any thoughts would be welcome 🙂

Thanks!