# Gravity Effect (Details)

**URL:** <https://forum.kirupa.com/t/gravity-effect-details/179165>\
**Category:** flash\
**Created:** [February 17, 2006, 6:10am UTC](https://forum.kirupa.com/t/gravity-effect-details/179165 "2006-02-17T06:10:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![fm47](https://avatars.discourse-cdn.com/v4/letter/f/50afbb/32.png) [@fm47](https://forum.kirupa.com/u/fm47)\
**Post date:** [February 17, 2006, 6:10am UTC](https://forum.kirupa.com/t/gravity-effect-details/179165/1 "2006-02-17T06:10:06Z")

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Ever had that math teacher that told you

9_9 = 81 and that’s just how it was?  
(9_9 = 9+9+9+9+9+9+9+9+9)

Well, I feel like the gravity tutorials I’ve looked through seemed to do just that. Either that or I didn’t understand them. At any rate, I was hoping someone could throughly explain to me of the elements required in, if possible, simplicity.

I know I need a few things and a few things I think I need, so here are my variables.

gravity = 9.8  
bounce = .7  
velocity = 2  
bottom = 400

So far, I’ve only an idea of what’s going on, but I don’t know exactly what’s doing what. On one tutorial, I saw that gravity = 1. Why was gravity = 1? I mean I know it’s not equal to 9.8m/s/s but why 1 and what happens if it’s .9, is it the same but just slower?

I know that I need a gravity speed and increase of speed over time, a bounce factor that determines how bouncy my object is, reversion of energy when it hits the ground and… something to make it go back down.