To get motion blur you have to slow your shutter speed down. Doing this gives your camera time to keep its shutter open for longer, allowing it to let more movement in the picture. If your camera has its shutter open for longer, it is more sensitive to movement. If you want the still things in your picture to be sharper, you will need a tri-pod or stand to keep it steady. Allowing movement to be in the picture also lets light in, so to not let your exposure to be over exposed, you would have to watch your aperture too.

To make your action pictures more sharper, you would have to speed up your shutter speed. Speeding up your shutter speed allows the camera to quickly take a picture of the action. Taking the picture a lot faster could let no enough light in, so you should watch your aperture, like in the motion blur pictures. The best camera mode to go on when shooting the action and blur motion would be the shutter priority mode.