there is a filter in photoshop elements called motion blur. i used it on my chop challenge and added smoke to make it look like the wheels were spinning but not the background or body of the car. you can set it at different levels too. for example i set the rear wheels with more of a blur than the front to make it look like it was moving but the rears were spinning faster lil more realistic.
0. Lasso around the car and Pull down tab Selections then Invert.
1. Then while still selected, Pull down tab - Effects -
2. Then - Blur -
3. Then - Motion Blur - and then choose a direction for it to blur...like away from the car.
You can choose in the Motion Blur box how much you want it to blur.