Why moving subjects are usually blurred in photos, but not always?

Question

Why moving subjects are usually blurred in photos, but not always?

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Answer 1

Shutter speed dictates this. The shutter is like a very fast curtain, and the longer it stays open the more movement can be seen. So if something is moving fast, it can look like a blur in the time the shutter is open. Now we ask, Why can’t we use the fastest shutter speed to avoid the blur? Well, the longer the shutter is open, the more light can be seen. So the picture’s result is essentially a balance between brightness and sharpness of moving objects. This is why low light photography can be difficult.