What is the phenomenon called where (generally in car commercials) tires that are spinning forward look like they're spinning in the opposite direction? What speed is this acheived at?
2007-05-20 16:54:46 · 9 answers · asked by JordanMR 2 in Science & Mathematics ➔ Physics
It is known as the strobe effect.
2007-05-20 17:10:24 · answer #1 · answered by cinu 4 · 1⤊ 0⤋
I can't remember what it's called but video records images by taking many still pictures per second and putting them together. In most cases, such as TV, there are 30 frames (pictures) per second. So if the tire is rotating at a speed greater than 30 revolutions per second, the video is going to start to lag the motion of the wheel and it will appear to go backwards. That's how it works, and the speed depends on the size of the wheel.
2007-05-20 23:58:22 · answer #2 · answered by Anonymous · 1⤊ 0⤋
The speed of the spinning tires and the speed at which the film was recored and played back give this illusion. You can see it yourself if you look at a spinning top that has spokes like a bicycle wheel.
2007-05-20 23:59:44 · answer #3 · answered by physandchemteach 7 · 0⤊ 0⤋
It happens on TV if the frame rate of the cameras is slightly higher than the revolution rate of the tires, thus, every frame catches the wheel in a position slightly to the right of the last frame, and it looks like the wheels are going slowly backwards.
2007-05-21 00:01:25 · answer #4 · answered by Target 2 · 0⤊ 0⤋
I believe it is based on the rims being used and camera angles. They don't actually go backwards, however I agree it is cool looking. Cheap hub caps typically have small slots and are plastic in nature while higher end have more design to them and therefore have more visual effects. TV commercials usually use the higher end models to improve attractiveness, thus better wheels...
2007-05-21 00:00:16 · answer #5 · answered by Ask a Physical Therapist 1 · 0⤊ 0⤋
i don't know a technical term for it... but i am fairly certain you are NOT talking about spinners...
have you heard the name before and just forgot or are you wondering if there IS a phenomenon for this?
i'm pretty sure this is the first time in my life i have actually ever thought about this for more than 3 seconds and am now very curious...
2007-05-20 23:59:41 · answer #6 · answered by Chels 2 · 0⤊ 0⤋
It's called an optical illusion. They're moving so fast that your brain can't keep up with it, and so your brain fills in the blanks as best it can -- and screws it up.
2007-05-20 23:58:15 · answer #7 · answered by kc_warpaint 5 · 0⤊ 0⤋
Optical illusion. it is the effect of light.
2007-05-20 23:57:26 · answer #8 · answered by exo 7 · 0⤊ 0⤋
it's called spinners. you buy them.
2007-05-20 23:57:20 · answer #9 · answered by kayleigh l 1 · 0⤊ 0⤋