Smooth start and end to animations? What's the intention?

Animations - smooth start and end? I've experimented with these.  Right now I can't see much of a difference. What would they be used for?
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Jamie GarrochSenior Technical Consultant at BrightCarbonCommented:
The intention of these properties is to reproduce the behaviour of moving objects in the natural world. If I move my cup of coffee across my desk, it doesn't move at the same speed. It starts from rest, accelerates to a speed and then decelerates towards the end of the movement. If an object doesn't use smooth start and end, it doesn't look natural to the human eye.

Have a look at the video at the end of this article for an example:

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What Jamie said. You can see this better if the animation is a long duration. For example, add a motion path animation and set the duration to 20 seconds. Then play it with the smooth start/stop turned on and again with it turned off. I think you'll see the difference then.
agwalshAuthor Commented:
Will try it with the longer duration as I tried it again and I still couldn't see it!
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