> For the complete documentation index, see [llms.txt](https://doc.playturbo.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.playturbo.com/playable-tools-content-editor/content-editor-user-guide/editing-page-module-intro/parameter-setting-area/exterior-layer-parameters/particle-parameters/physics-parameters.md).

# Physics Parameters

Physics parameters support adjusting the velocity in the X and Y directions.

<table><thead><tr><th width="175">Image</th><th width="111">Features</th><th width="310">Description</th><th>Preview</th></tr></thead><tbody><tr><td><img src="/files/47HW35jdI0tUfw1CpYZb" alt=""></td><td><strong>Gravity</strong></td><td><br>1. Suggested value range: -2000～-2000, it is better to adjust according to the multiple of 50<br>2. Adding gravitational acceleration to a particle adds a parabolic effect to the original trajectory of the particle, simulating the real world<br>3. The corresponding relationship between the gravity value and the XY axis direction is shown in the figure:<br><strong>- Take the center of the transmitter as the origin</strong><br><strong>- On the X-axis, the left side of the origin is negative, and the right side of the origin is positive</strong><br><strong>- On the Y-axis, positive values are below the origin, negative values are above the origin</strong><img src="/files/Qb9hC3BBfqxo4UwchSJZ" alt=""><br></td><td><img src="/files/XRRq6vN0rkqD1rebfwj0" alt=""></td></tr></tbody></table>