LSL Wiki : llGetAccel

vector llGetAccel()

Returns the current acceleration (in m/s²) exhibited by an object.

Example: If you create a cube, check its physics checkbox, and drop it from a height, it will initially return <0,0,-9.8> (the value for gravity in SL) while falling. This value will decrease, because some funky wind resistance seems to be at work to allow falling objects to achieve terminal velocity.

Compare with: llGetVel

This function does not actually return the acceleration on the object. It generally returns (llGetForce()/llGetMass())+<0,0,-9.8>, unless the object is at rest in which case it returns <0,0,0>.

To get the actual acceleration, you need to keep track of velocity and measure its changes.

Try putting the following script into an object.

Example:

default
{
    state_entry()
    {
        llSetTimerEvent(0.1);
        llSetStatus(STATUS_PHYSICS, TRUE);
    }
    
    timer()
    {
        llSetForce(<1,2,llGetMass()*1>, FALSE);
        llSetText(
            "llGetAccel()="+(string)llGetAccel() + "\n" +
            "llGetForce()="+(string)llGetForce() + "\n" +
            "Force/Mass=  "+(string)(llGetForce()/llGetMass()), <1,1,1>, 1);
    }

}

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Functions | Dynamics