Bernoulli's Principle

Pressure is greater in the stationary fluid (air) than in the moving fluid (water stream). The atmosphere pushes the ball into the region of reduced pressure.

Category:

Science & Technology

Tags:

• PHYisFUN
• Science
• Physics
• Bernoulli
• Pressure
• Differences

[midgetking101]

is that a ping pong ball or a golf ball cause it looks like a golf ball

[phyisfun]

It's a ping pong (table tennis) ball.

[linus7213]

How do you get the ping pong ball to stick to the string?

[phyisfun]

using a masking tape. =)

[LTF85199]

you never explained why........ please do an explanation video.

[phyisfun]

Pressure is greater in the stationary fluid (air) than in the moving fluid (water stream). The atmosphere pushes the ball into the region of reduced pressure.

[mrsnail445]

aaaargh that's Coanda NOT Bernouilli!! I should now considering that's all ive studied for the past 4 years!! Plus Bernoulli is ONLY valid ALONG a streamline not across streamlines so you cannot invoke the argument you've used.

[dy2600]

Not only Bernoullial force held the ball, fluid surface tension of water also exert attraction towards the ball, especially when the tap was turned low which holding the ball at one side. It would be less complicated situation if using blow dryer to blow air instead of liquid.

[tyronejk]

@phyisfun bs the pressure from the water is much greater than surrounding air pressure. the ball stays there because of surface tension. look up coanda's principle on wikipedia and find the sentence with "misconception" in it.

[wolverin648]

duh theirs obviously another string making it move closer to the water!

[saravana733]

@phyisfun Really interesting

[saravana733]

@phyisfun Really cool

[MrRubyrubyruby]

mom: Are you doing something?

me: No not really

mom: Come do the dishes

me: ok

[Torishaka]

@sydfan526 Planets differ in their acceleration constants, but not in the fundamental constant. If you consider the Voyager II satellite, the "sling-shot" trajectory they calculated used the gravity constant. Calculations of an electromagnetic nature, on the other hand, use the constant for the Permittivity of Free Space.

[sydfan526]

@Torishaka gravity is relative. constants shmonstants. other planets have different constants, if u will. Its relative to the spin of the planet, the electromagnetic field around the planet. Old school sez constants for gravity.

using yer electron sink idea - think of the static electric charge of the pingpong ball. Those charged electrons want to sink into the water stream, drawing the ball near to the water with them. Happens to be sideways looking to us.

Gravity is a function of EM

[Torishaka]

@sydfan526 Electromagnetism can't be applied to this situation; even if it was charge attraction, the water would quickly dissipate any established charges by acting as an electron sink. Furthermore, gravity and electromagnetism are exclusive principles, they're two different fundamental forces. It's a bit better to think of gravity as bends & compressions of space itself. The constants involved in each force are completely different, as well as their field behaviour towards matter.

[sydfan526]

@TheMystery1singer Yep - gravity is an effect of electromagnetism, not a universal given. One day science will catch up. Still this particular sideways attraction was caused by low airpressure, not unlike sideways lift if an airplane wing was involved. There could still be an electrical explanation tho as well, as the lowpressure of tornados is just another way for voltage to be transferred from high in the sky to the earth. The water-cloud vortex moves down to meet big pingpongball earth.

[TheMystery1singer]

@sydfan526 LOL...sideways gravity??