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The Physics group controls how particles move once emitted. You can set properties such as Gravity, Turbulence and controls for making particles bounce on other layers in the composition. The concepts are pretty advanced but the controls are quite simple.
The Physics Model determines how the particles move. There are two Models available.
Gravity makes particles fall downwards in a natural way. The particles pick up speed as they fall, just like any object in real world would. Low values make the particles fall slowly. High values make the particles fall more quickly.
This parameter enables full control over the particles' time travel. Time Factor can be used to speed up or slow down the particle movements, or freeze them completely, or play their movement backwards. All actions are keyframeable. Read more about Physics Time Factor.
The Air model is useful for making particles that move naturally through air. This group is active when Air is chosen in Physics Model. Read more on the Air group page.
The Bounce model is used to make particles bounce on layers in the composition. This group is active when Bounce is chosen in Physics Model. Read more on the Bounce group page.