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Panel: Properties > Render Properties > Motion Blur

Blender’s animations are by default rendered as a sequence of perfectly still images. While great for stop-motion and time-lapses, this is unrealistic, since fast-moving objects do appear to be blurred in the direction of motion, both in a movie frame and in a photograph from a real-world camera.

Motion blur example. (blend-file)
https://en.blender.org/uploads/0/03/Blender2.65_motion_blur.blend

Motion Blur

Position

Controls at what point the shutter opens in relation to the current frame.

Start on Frame

Shutter is starting to open at the current frame.

Center on Frame

Shutter is fully opened at the current frame.

End on Frame

Shutter is fully closed at the current frame.

Shutter

Time (in frames) between when the shutter starts to open and fully closed. For example, shutter time 1.0 blurs over the length of 1 frame.

Rolling Shutter

Creates a rolling shutter effect.
Rolling Shutter

None

No rolling shutter effect.

Top-Bottom

Renders rolling shutter from the top of the image to the bottom.

Rolling Shutter Duration

Controls balance between pure rolling shutter effect (if the value is zero) and pure motion blur effect (if the value is one).

ｉNote

If there are particles or other physics system in a scene, be sure to bake them before rendering, otherwise you might not get correct or consistent motion blur.

 > See also

Each object has its own settings to control motion blur. These options can be found in the Object tab of the Properties editor. See object setting for more information.
object setting

Shutter Curve

Curve defining how the shutter opens and closes.

The X axis is time, Y values of 0 means fully closed shutter, Y values of 1 means fully opened shutter. Default mapping is set to when shutter opens and closes instantly.