2006-10-13 02:20:23 · 14 answers · asked by Anonymous in Science & Mathematics ➔ Physics
This usally happens in films and depends on the rotation speed of the wheel, the spacing of the spokes and the shutter speed.
If the conditions are just right then the wheel turns enough that between frames a spoke moves into the position occupied by its neighbour. Since all the spokes look alike this gives the illusion that the wheel hasn't turned at all.
2006-10-13 02:31:18 · answer #1 · answered by DazerUK 2 · 0⤊ 1⤋
Right! Well this is because the wheels are moving so fast the spokes hit the same spot (as the next one moves forward) as the spokes infront hence the motionless effect, that sounds like a load of rubbish but i hope you can understand.
2006-10-13 02:30:33 · answer #2 · answered by ♥Lexi♥ 3 · 0⤊ 1⤋
I presume that you mean on film.
It is to do with the capture of images, 50 images for every second of film. If the wheel rotates with such a speed so that each image of the wheel looks the same, in that the spokes will either rotate to the next spokes position or a multiple of that.
2006-10-13 03:11:36 · answer #3 · answered by advent m 3 · 0⤊ 1⤋
On television an in movies, it's because of the "flicker effect". You can simulate this effect by spinning a spoked wheel under a florescent light. Florescent lights actually flash 60 times every second (50 in Europe).
2006-10-13 02:30:51 · answer #4 · answered by Anonymous · 0⤊ 1⤋
Your mind isn't fast enough to process the image at the speed the wheel is moving. Your mind in fact is trying to interpret what the image is, and is actually visually slowing it down. Try looking directly at the center of a ceiling fan when it is moving at top speed, then try to focus on the edge of a single fan blade while it is still moving. See how your brain adapts to it.
2006-10-13 02:31:32 · answer #5 · answered by Denny M 3 · 0⤊ 1⤋
Do you mean on tv ?
Its because of the flicker rate of the film.
If the flicker rate is slightly faster than a multiple of the wheel rotation then the wheel will "move" backwards slowly.
If the rates are the same, the wheel will be "stationary"
2006-10-13 02:32:05 · answer #6 · answered by Michael H 7 · 0⤊ 1⤋
I don't understand your question fully. Our faith is in our logic rather than believing in false deities that have just as much chance of having their existence proven as the tooth fairy. We know we're right so we have no need to shove our beliefs down the throats of people who are religious. Which, by the way, is the complete opposite of what religious people do.
2016-05-21 22:40:34 · answer #7 · answered by ? 4 · 0⤊ 0⤋
Without getting too technical, it is a strobe effect.
A very simple way to show this is hold your hand at arms length,
put out one finger, as if pointing, and wave it rapidly in front of your monitor or TV. They use this system by shining flashing light on car engines to check timing.
2006-10-14 12:06:13 · answer #8 · answered by Dr David 6 · 0⤊ 0⤋
Optical illusion mate. Happens on films especially old westerns when there's a stagecoach going along.
2006-10-13 02:22:33 · answer #9 · answered by Anonymous · 0⤊ 0⤋
There going round too fast for the eye to focus in on them
2006-10-13 02:28:01 · answer #10 · answered by Anonymous · 0⤊ 2⤋