how do flys get upside down on the ceiling?
111166
When they fly into a ceiling, their feet stick on the ceiling same as with a wall. Flies, like all insects have 6 legs, 2 in the "front" and 4 in the "rear" --\napproximately. As the fly approaches the ceiling, it "reaches up overhead"\nand grips the ceiling with its two front legs. It's forward momentum carries the rest of the fly in the direction of flight. It then does a "180 degree"\nflip planting its 4 rear legs on the ceiling, landing in the opposite direction as the initial direction of flight.\n\nThis is not as bizarre as it sounds. Human gymnasts on the uneven bars perform similar trajectories in some of their exercises.
1088912
Walking upside-down requires a careful balance of adhesion and weight, and specialized trekking tools to combat the constant tug of gravity.\nEach fly foot has two fat footpads that give the insect plenty of surface area with which to cling. The adhesive pads on the feet, called pulvilli, come equipped with tiny hairs that have spatula-like tips. These hairs are called setae.\nScientists once thought that the curved shape of the hairs suggested that flies used them to grip onto the ceiling. In fact, the hairs produce a glue-like substance made of sugars and oils.\nFlies need sticky feet to walk on ceilings, but not so sticky that they get stuck upside down. So each foot comes with a pair of claws that help hoist the gooey foot off the wall.\nFlies use several different techniques to get unstuck: pushing, twisting, and peeling its footpads free.\nThe combination of the feet hairs' rounded tips, the oily fluid, and a four-feet-on-the-floor rule help the inverted insect take steps in the right direction.
40673
Surface tension, or the attraction of water molecules sideways and inwards at the surface of the water, cause water to act like an elastic trampoline. This lets the animal float without breaking the surface.\n\nTo propel itself forward, the insect's feet must push water backward (for every action of the bug there is an equal and opposite reaction on the water). The rowing action of the legs produces miniature vortices (whirlpools) which move backward from the bug's feet.
884352
Interesting question. See, in order to achieve lift, an airfoil (or bird's wing in this case) must deflect air down in order to achieve an upwards lift. This is a consequence of Newton's 3rd Law ("For every action, there is an equal and opposite reaction").\n\nNote that this DOES NOT imply that the downwardly-deflected air reacts against the truck bed. This is a common misconception; note that rockets have no trouble zipping around space, even though their exhaust has nothing to react against. \n\nOne caveat though: naturally, if the airfoil or wing passes close enough to the truck bed, the deflected air will push against it, causing a small force, like when you feel the breeze coming off of a ceiling fan. However this is simply a consequence of the proximity of the objects rather than a physical interaction between them.\n\nSo in answer to your question, yes. If every canary were to take flight at the exact same instant, and the truck is tall enough that the air deflected from their wings does not reach the floor, then the truck will measure its "canary-free" weight on the scale:\n\nW = (M - m)*g\n\nW = 19,900 lbs\n\n-----\nBONUS POINT\n-----\n\nFish are different from birds in that, for a bird to move in 3-dimensions, it has to deflect air (as discussed above). A fish, however, does not. The fish maintains its position using Archimedes Principal; that is, by absorbing and expelling water or expanding and contracting its rib cage, it can alter its "altitude" in the water, just like a submarine.\n\nThe bird remains in the air by constantly deflecting it down; a fish remains above the bottom of the tank by actually resting on the water. In this sense, the weight of the fish is transferred through te fluid as though the fish were part of the tank itself (regardless of the fish's position therein).\n\nThus: canaries flying inside the truck - the truck measures it's empty weight; fish swimming inside the truck, the truck will measure its loaded weight.\n\n\nHope that helps! :)
950958
your dvd player is upside down
84047
up, down, and upside down are relative.  You consider up to be away from the pull of gravity (away from the center of the earth), and down to be the opposite.  No, they are not "upside down", but their head is pointed in the opposite direction of yours (assuming you are standing normally, they are too, and you are on opposite sides of the world).
490250
The Flag Code of the United States says that flying the flag upside down is a sign of distress involving great danger to life or property.  It is NOT a sign of disrespect at all, but a sanctioned way of flying the flag under dire circumstances.
1031888
Flys don't move with the lift.  If the fly is in the air when the lift starts moving up, the fly must also move up -- or it will end up on the floor.  If the fly is perched somewhere on the lift wall, then it will gain momentum with the lift.  If the fly releases itself from the wall, it first has no problems because it is traveling at the same momentum as the lift, but it immediately starts to lose the momentum and must again fly in the same direction as the lift.\n\nTHE FLY IS NOT HELD IN PLACE BY THE AIR IN THE LIFT.
1170375
That could happens in some fans because they come with a special  switch to  change the rotation of the blades. The  warm air always are near the ceiling where the fans is and the cold air is at the floor level.During the winter what the fan do is  generate  a circulation path from  top to bottom like a clockwise movement from the floor to the roof bringing  the heat to the floor; on the  summer, when you switch the rotation,  you invert the process. When you go to the store you can see a diagram on the side of the box that illustrate this...
279671
you can't do sideways only thing you can do is upside down\n\nalt+ctrl+up arrow/down arrow
4696
I believe they swim around for awhile then slowly turn upside down and float to the top
42194
It's an illusion.  \n\nWhen a magician claims he can fly, of course everyone in the audience looks for the cable hanging from the ceiling which is holding him up.  But you couldn't see it, and his assistants probably swung things over his head showing that there wasn't anything there, right?  \n\nWell, of course he is being held up by SOMETHING.  The trick is that the cables stretch SIDEWAYS from his body.  He is still being held up, but the cable isn't where everybody knows it should be, and so they don't see it.  Additionally, he probably had some sort of glitzy, shifting, reflective backdrop to create optical confusion and further hide the cables.
686639
just blow air through your nose when you are upside down\n\nwater should not go up while you are right side up
61716
The air inside the vehicle is moving the same speed as the vehicle. To the fly it's still air, unless a window is open, then the fly may not be able to fly normally.
59236
Aircraft are able to climb and maintain altitude by utilizing a combination of the Bernoulli effect and simple momentum transfer in the air flow to generate lift. Lift is generated primarily by the wing of the aircraft. \n\nTo generate lift using the Bernoulli effect, the cross-section of the wing is shaped in such a way that the distance from the leading edge to the trailing edge is greater along a path that runs over the wing than under the wing. As the aircraft is propelled forward, air necessarily flows both over and under the wing. Because of the greater distance that air must travel over the wing, the air pressure over the wing is less than the air pressure under the wing. This difference in pressure between the top and bottom of the wing results in a net upward force, or lift, on the wing. This is the Bernoulli effect. \n\nOne way of understanding the physical basis of the Bernoulli effect is to consider that, since the path of the air flow over the wing is longer, the air over the wing is forced to expand into a greater volume than that flowing under the wing. Consequently, the air pressure over the wing is necessarily lower than that under the wing. \n\nLift can also be generated by dynamic momentum transfer from the airstream. In this method, the tilt, or angle of attack, of the wing relative to the overall direction of motion causes the flow of air striking the under surface of the wing to be turned, or deflected, downward. That is, a downward momentum is imparted to the airflow by the deflection induced by the wing. Newton's law dictates that a compensating reaction force (lift) acts in the upward direction on the wing according to F = dp/dt, where p is the momentum (F and p are vectors). This is the same principle that generates sufficient upward force on water skis to keep a skier from sinking below the surface. \n\nIn practice, the aerodynamics of flight are complicated by many other effects. Obviously, opposing the upward lift is the downward force of gravity. Likewise, opposing the forward thrust of the aircraft is the backward force of drag created by resistance to passage through the air. Also, both the Bernoulli and momentum transfer effects depend upon the smooth, or laminar (streamline), flow of air around the wing. Various factors can induce turbulence in the air flow that (generally) spoils lift, increases drag and decreases the overall efficiency of the aircraft in flight. \n\nFor more details, see the web site: \n\nhttp://www.aviation-history.com/theory/index-theory.html
8500
It depends on what they are flying.  Many large planes and spacecraft have overhead panels with switches, and the pilot would need to be able to reach them from a sitting postion especially if they are strapped in.
588068
there is the safety belt that attaches you to the rollercoaster car, and the tracks that attach the car to the frame.  however there is a way to go upside down and not fall out.  if you are going fast enough , and hit the curve up, you are now accelerating perpindicular to your instantaneous path.  this is know as centrifical force.  if you can maintain this it is possible for you to make it out of the loop.  you can see this in action in skateboard videos where skaters go around the inverted loop.