Transition Acceleration
The transition duration sets the time it takes to move from one snapshot to another in a presentation. The transition acceleration manages that transition in the presentation. There are four types of transition accelerations to select from.
Linear - The movement of the components transitioning from one snapshot to another happens at a constant speed over the time of the transition duration. -
Accelerating - The transition speed gradually increases within the transition duration. 
Decelerating - The transition speed gradually decreases within the transition duration. -
Smooth - The transition speed gradually increases and then gradually decreases within the transition duration. This type is a combination of accelerating and decelerating types.
Note: Linear type is the default setting for a transition acceleration.
Command Access:
In the storyboard editor, click the acceleration type icon in transition display
Select an acceleration type.
Animation: