This is a painless way to add motion to a still photo, and because you’re using a Layer Mask, you have a lot of flexibility in where the effect is applied, making it easy to remove or edit any excess motion.
Open the photo you want to give a motion effect. Duplicate the Background layer in the Layers palette by pressing Command-J (PC: Control-J).
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Go under the Filter menu, under Blur, and choose Motion Blur. The Motion Blur dialog presents two settings: Angle lets you choose which direction the blur comes from and Distance determines the amount of blur. ...