Sometimes when you look at a wheel (with spokes) ie wagon wheel when it's going forward look like the wheel is spinning in the oposite direction?
2006-09-11 11:21:49 · 6 answers · asked by Ross 3 in Science & Mathematics ➔ Physics
Red Hammer, it seems your the authority on Gay?
2006-09-11 12:17:34 · update #1
because your eye can only see so many frames per second (something like 70) and when the weel moves faster than 70 frames you do not see all of the weel turning so you may see it at 12 o clock and then 9 o clock because you dont see 3 or 6 it looks like the wheel is spinning backwards
2006-09-11 13:12:56 · answer #1 · answered by Anonymous · 2⤊ 1⤋
If you are taking a film of the motion, a picture is taken about 30 times per second. If the wheel is spinning slowly, a spoke won't move much in the 1/30 of a second between pictures. But if the wheel is spinning a bit faster, a spoke can move almost to where the next spoke was in the previous picture. The effect is that the second spoke looks like it moved backwards a bit. If spoke moves to exactly where the next spoke was in that 1/30 of a second, the wheel will look like it isn't moving at all. If it goes a bit faster, it will look like the wheel is moving slowly forward.
The same type of thing can happen with regular light bulbs because the electricity from the wall socket usually cycles 60 time a second. The effect isn't as larger in this case, though because the light doesn't go dark in the middle of the cycle.
2006-09-11 13:19:49 · answer #2 · answered by mathematician 7 · 2⤊ 0⤋
Especially on film. The film "takes a picture - say 8 times a second - and then plays it back by flashing the 8 pictures on a screen in sequence. You eye cannot distinguish the individual pictures and sees the motion instead.
If the wheel is spinning at the right speed, the picture is shot before the spokes have rotated a full 360 degrees - and the spoke appears on the picture somewhat behind where it should be - and when the pictures are flashed in sequence, the effect is clearly a wheel that is turning backward when the wagon is going forward.
This is called a strobe effect. The exact same effect can be duplicated with a strobe light.
2006-09-11 11:32:05 · answer #3 · answered by LeAnne 7 · 2⤊ 1⤋
Because your eyes are just taking snapshots of the wheels current location; if those snapshots are times right the motion seems to go in reverse.
2006-09-11 11:26:33 · answer #4 · answered by bruinfan 7 · 1⤊ 0⤋
It is an optical illusion That is all
2006-09-11 11:26:35 · answer #5 · answered by Anastasia 2 · 0⤊ 0⤋
because you have gay vision
2006-09-11 11:24:29 · answer #6 · answered by Anonymous · 1⤊ 1⤋