Why is a fly in a moving train able to hover about without hitting the walls?
90020
Every object touching and having good grip on the body of the train, move along with the train.This means that every object inside the train moves with the same velocity as that of the train.Accordingly, fly is also moving with the train. It has gained this speed by sitting on the interior body of the train.According to theory of physics, absolute velocity has no effect and diffrence when the frame of reference is within the object.Therefore fly while flying makes two kinds of motion 1) It is moving along with the train 2) it`s flying in its desired directions.The motions (1) & (2) are true to the observer outside the train.But, motion (2) is true to the observer inside the train because the observer inside the train is also moving along with the train.Moreover, When the fly tries to enter the fast moving train from outside the train, then the probability of striking on the panel (wall) of windows is more with respect to the speed of the train.This is because the fly is not in the speed of the train.You might have observed, some of the men on the platform enter the moving train by moving along with the train for some distance and jump into the train. I think this is enough to comprehend.
201673
Because you are moving fast too. It's the same reason you can jump on a train and land in the same spot.
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.
1139376
It has something to do with being top heavy.  Each arm alternates front and back individually, however there are certain parts of the anatomy that bounce up and down simultaneously, causing interference on the forward arm side... This causes the duck waddle run,,,    They cant escape it!  Even if they put both hands up palms forward and run the carwash motion.  That causes certain anatomy to bounce side to side causing an uneven oscillation.  -- Dancing in a consistant slow bounce = graceful.  Figure skating is on skates (no bouncing) = graceful
160628
i guess you are talking about very small flies.  well there may be millions of them and you had the impression that these flies are moving at the same speed of your car.
664508
because of inertia it will be traveling at 60mph as it leaves the car\nbecause of the fly's body shape theoreticaly it would give it lift assuming that the fly was facing foward\n\nrealisticly it was facing sideways, so the air would be traveling over its body sideways it would have been plummeted into the ground and its wings would have been ripped off
250759
Remember, momentum is affected by mass.  The fly's mass makes it easier to dissipate the inertia.  So it seems that the fly could crash into the front, but not likely. Of course, most people are worrying about other things at the time, so no specific measurements have been taken!  The air inside has mass also, so in effect the car and the air mass have become one unit, in which the fly is also a small part.  When it stops, it helps everything else stop.
334289
I assume you mean a fly in the car with you.\n\nThe reason is inertia.  You, the car, the fly, and all of the air in the car share the same inertia, which means relative to each other, you are motionless.  Open a window, and inertia and air pressure differentials will circulate air through the car, and hopefully suck the little bugger out so you can drive in peace.
551207
Air has a mass.\n\nTrain has a much bigger mass and it's moving.\n\nNewton's law that for every action there is an equal and opposite action means that for as hard as the train is pushing against it, air is pushing back. Air doesn't have a very large mass so a lot more air is needed to stop a train. Pressurized air could stop the train if you could get the train to run headlong into an airlock and jack up the pressure.\n\nAnyway, the air that is unable to push against the engine is pushed out of the way. What you are feeling on the platform is the continuous air current that leads in front of the train as it passes.\n\nThink of a speed boat on the water, the wake of the speed boat is similar to what the air current looks like travelling around the train.
363865
As the car moves along, air passes over the top of the roof, creating an area of low pressure.  The air pressure inside the car, having a higher pressure than outside, then forces the canvas upward.\n\nThe principle is similar to that of an airplane wing.  Of course though, there isn't anywhere enough lift generated to make the car fly.
446938
Walking around and not knowing my fly is open.
1102208
So if the drivers scrape the wall, they aren't sitting right next to it. It gives them a little safety buffer.
114517
it means the object is not moving, as the distance remains constant
1024998
well as far as i know most bugs have hairs on there legs.there hairs fives them a sort of ststic cling. i read this i while ago becuse im not big in entomology. but imangine it like this .the hairs disturb the atoms on the wall which causes dispersion forces which cause the very small bug  to stick to the wall...also some bugs have suckers and some produce sticky secretions.\n\nby the wat water flees can walk on water because there light and they don't break the water membrane but will drown in you add soap to the water.
159363
Push it.  A mousetrap exerts force only for an short period of time.  You're not going to be able to make the car keep moving for very long.\n\nAlso, I don't know what "the string thing" is.  Perhaps you could explain this?
751391
if it is not a case of dirty rollers making the ball catch when it's moved, then it could be caused by vibrations - *especially* if your computer's tower is sat on the same desk that your mousepad is.\n\nyour pc actually vibrates slightly when the fan(s) inside the tower spin to cool down the processor and the inside of the tower.\n\ntry temporarily moving the tower onto the floor and using your computer like that for a few days to see if the shaking mouse pointer has stopped - if it does you need something between the computer tower and the desk to disperse vibration.
1004904
While moving at constant speed there are no forces acting on any of the objects inside the car in the direction of motion and therefore they remain at a constant speed.  During accelerations the mosquitoes will get left slightly behind, however the air resistance from the air molecules inside the car will quickly bring it up to speed.  The air molecules have a slight deflection as well.  Try this fun experiment: tether some helium balloons inside of your car and close all the windows, now accelerate, turn or stop.  The balloons don't go the direction you expected do they.  They go forward when you accelerate and backwards when you decelerate, they even point in towards the inside of a turn.  The reason for this is that the air molecules congregate to the outside of the turn, or towards the back when accelerating, this pushes the less dense helium away towards the lower density areas.