For this exercise I set my camera up on a tripod and got someone to roll a tyre along some decking in my garden. With poor light quality some high ISO was needed for the faster shutter speeds.
At 1/2000s the tyre looks motionless, with no suggestion of movement. 1/500s is similar, again looking static in its surroundings. At 1/125s we start to see the slightest amount of blurring around the edge of the tyre although still not giving a sense of movement. Not much change at 1/100s and a little more blur at 1/60s, it's not until we get to 1/30s do we start to see some blur and distortion to the shape of the tyre as motion really begins to be suggested. 1/15s is the last image to show a definite circular shape whereas at 1/8s we could not be certain of what the object was if we were to only have seen this image. At 1/4s we have lost sight of any sides of the tyre and only blurring at the top and bottom of the tyre tells us something is there. 1/2s only has a ghostly tracer along the top of the tyre running half the length of the image and finally at 1s the tyre is now practically gone with only the slightest trace of the top of the tyre faintly crossing the whole distance of the shot.
All these images could have different results if the tyre was going faster or slower but we tried to maintain a constant average speed for every shot,
The faster shutter speeds have little use if movement was the desired effect but are excellent if motion is freezing the action was required. I'd say for these shots, 1/30s was the best outcome for suggesting movement without totally losing the shape of the tyre. The very slow shutter speeds are probably best used for suggesting lots of movement over time for example a city scene at night using car lights as tracers but showing the static buildings sharp.
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