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Fine-tuning speed and velocity
After you have set the shape of a motion path or created keyframes for a property, you need to adjust the speed (for spatial properties) or velocity (for temporal properties) to better simulate the natural world. Using the Speed graph or the Velocity graph, you can adjust motion or the rate of change for a value just before and just after a keyframe.
For example, you can change the motion of a layer so that it slows just before a keyframe and then speeds up just after the keyframe; or so that it moves quickly over a certain distance and then slows down smoothly. By adjusting the rise and fall of the appropriate graph, you can control how fast or slow a value changes from keyframe to keyframe.
Note: Like the Value graph, the Velocity graph displays x, y, and z (3D only) values in different colors: x values are red, y values are green, and z values are blue.
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