If a fly is in your car as you are going 65 miles an hour, why doesn't he get squished on the back window?
374810
they dont get quished but u can notice that they keep hitting the glass and we wonder why are they flying in2 d glass...so they collide with the glass a few times cos of relative motion and then learn 2 keep up
1087367
When the car is traveling at 100 mph, everything at rest with in the car is also traveling at 100 mph, this includes you, the air, any any flies present.\n\nWhen you suddenly stop the car, you are not just stopping the car bu also everything inside as well.\nPretty much everything within the car slows down/stops at the same rate (assuming ample "Stopping" forces).  So when you step on the brakes, the fly slows down too, despite the fact that it is not physically connected [strapped down] with the car.\nThe fly does not slam into the windshield for the same reason the back of the car does not turn into a vacuum.\n\n\nEDIT:\n"memento mori", inertia would be a reason why the fly might indeed hit the windshield, not why it might not.\nInterial is the property of matter which says that objects tend to continue doing what they are doing (objects at rest stay at rest, objects in motion stay in motion, ...Newton's 1st law).\nIf the fly was in motion and you slammed on the breaks, the fly should stay in motion, not come to a rest.....unless of course, something did work on the fly (applied a "stopping" force over a distance) in order to change its kinetic energy.
149924
it will hit the back of  the car
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.
1045251
Flies avoid being hit by raindrops, not by dodging them, but by the drop of rain creating a tiny pressure wave ahead (below the raindrop).  This wave pushes the fly sideways and the drop of water misses it.\n\nIncidentally, this is also why fly swatters have holes in the surface, i.e. to reduce the pressure wave - otherwise, flies would escape most efforts to swat them.
414619
No. It would still be called a fly because that's what it is. It would be called disabled. Oh no, that's not pc is it. It would have to be physically challenged.
561115
Question -   Please explain how molecules in the air cause air\nresistance. Why air resistance is larger when a car a travelling faster?\n---------------------\nSharazaad,\n\nEven though you cannot see them, air molecules (a mixture of gases, mainly nitrogen and oxygen) are \njust like all other molecules inasmuch as they have mass and occupy space. Anything moving through \nair must push the molecules out of the way.\n\nThe faster the object moves, the faster the air molecules are encountered and the greater are the \nnumber to be pushed aside. This requires a larger force that necessary when the object is moving \nslowly. Consider swimming: The faster you swim, the harder it is to push the water molecules out \nof the way.\n\nStreamlining a car is a way of making it slip through the air more easily. Cars with narrow or \nwedge-shaped front ends and smooth, gentle curves allow it to slip through the air more easily \nthan bulky things like large trucks with large, boxy, flat front ends. Even something so simple \nas keeping a car clean and polished will help it slip through the air more easily.\n\nRegards,\nProfHoff 869\n=====================================================\nSharazaad,\n\n\nMolecules in the air have mass.  Even though they are invisible, they are\nstill there, and they still have to be pushed out of the way for a car to\noccupy the space that the air is in.  This now should make sense WHY air\nresistance even exists.\n\nNOW.  Why do greater speeds cause there to be an even greater air\nresistance.  It is true that there is barely any appreciable air resistance\nto a car going 10 MPH versus 60 MPH.  But at 60 MPH, even though there is\nthe same amount of air, the resistance is much greater because the car needs\nto move the air out of the way MUCH MUCH QUICKER.  I do not know if you can\nreally speak about viscosity of air (non - liquid).  But air really does\nbehave like a liquid when it comes to resistance.  HOW?  The air that is\nexisting on or above the sidewalk WILL ALSO RESIST the air molecule that is\nbeing struck by your car and pushed to the side.  SO, this is why at higher\nspeeds you will have a much greater resistance because you are FORCING THE\nAIR to move not at 10 MPH but NEEDING IT to move out of the way at 60 MPH.\n\nYou could say that the relationship between air resistance (r) and velocity\n(v) is proportional.  However, I think I read somewhere that resistance (r)\nis ~ velocity (v)^1.5\n\nPlease do not quote me on that ... but I am pretty certain I read it in an\nMath book for Engineers.  So there may be some credence to it.\n\nHope this helps.\nDarin Wagner\n=====================================================\nAir resistance is caused by the car banging into air molecules and\nincreasing their momentum in the direction the car is going.  Since the car\nexerts a forward directed force on the molecule, by Newton's 2nd law (for\nevery action there is an equal and opposite reaction) the molecule exerts a\nforce on the car in the backward direction, tending to slow the car.\n\n\nOf course, a molecule has so little mass, it exerts an extremely tiny force\non the car.  However, there are so many molecules that the cumulative effect\ncan be large.  You might also imagine what would happen if molecules were as\nlarge as bowling balls!  I think you can picture how the forces could be\nvery large.\n\n\nIncidentally, the molecules are moving at speeds much faster than the car is\ngoing and in random directions.  So some hit the car from the rear and speed\nit up a little (very little).  However, one coming from the front slows the\ncar down by a larger amount because the car's speed is added to the\nmolecule's speed for a molecule coming from the front and subtracted from\nthe molecule's speed for one coming from the rear.\n\n\nBest, Dick Plano, Professor of Physics emeritus, Rutgers University\n=====================================================\nHi Sharazaad,\n\nGood question,
185249
Don't listen to the other guy because it actually lowers!\nThe faster you go the pressure builds up and that airflow pushes down on the vehicle. MIKE
163803
when the windows are rolled up the air in the car isn't moving as fast as the air outside the car. the air is moving as it would if the car were perfectly still almost
937731
Because the faster a vehicle goes, the greater the momentum.\n\nMomentum = mass * velocity, so it increases with velocity.\n\nWhen you get in an accident, and if your car is brought to a sudden stop, you still have this momentum, this velocity. If you are not strapped down, then your movement, at the velocity continues, regardless of the new post-accident velocity of the car. If it is stopped then you will impact the instrument panel and windshield with the same velocity and momentum you had.\n\nIf you have an accident without a seatbelt, without airbags, you will get seriously messed up. And the faster you are going, the worse off you'll be.
12602
If I understand the question correctly, I think the force you're looking for is inertia. Your body is moving at the speed of the car - then the car stops. Now the car has no speed, but you're still moving forward at that speed until something (hopefully the seat belt) acts to stop you.\n\nIf you're referring to the force provided to stop you - that's the Newtonian counter-force to your inertia moving forward.
1025041
It will continue to hover because the air that it's wings are beating against is moving at the same speed as the train. This of course is assuming that the premise requires that all windows are shut and the air is still.
181081
That is a very good question.  The weight of the fly is inside the airplane whether it lands or not.  When I asked a similar question years ago, I was told that the weight of the fly is transfered to the surface under it while it is flying.  I then asked: "If that is true, how come when a huge airplane flys over my head I'm not crushed?"  They answered because the weight is dispersed over a large area of the earth.  I don't understand any of that physics stuff.  I will look forward to checking back to see if some egghead will explain it for us.  Good luck.
6374
The second and fourth answers are essentially correct and apply in ideal circumstances, with a fly that is just hovering (not flying forward or backward in the car), and in air that has infinitely low viscosity (is very very thin).\n\nBut this isn't simply a Newton's first law problem [1], since a fly is so small and light, and is effected by the movement of the air it is flying in.  For example, if you open the windows, a stationary hovering fly might get sucked out sideways, even with a constant velocity.\n\nSo when you suddenly accelerate, a ball on a roller might hit the back window, but a small, lightweight fly won't neccessarily hit the back window since the fly is in a fluid (air) that prevents the free movement of the fly through it.
289551
Because if anything gets thrown it will be less likely to scratch the windows. Its to protect them. You don't want to finish the job just to see all the windows have been scratched or have paint on them.
4088
because the air inside the car is moving with the car
44366
einstein's theory of relativity.  in the frame of reference of the car, you are stationary, the fly is stationary, and everything else in the car or moving with the car is stationary. this is why if you are in a car and drop a book onto the seat, it goes straight down, not toward the back. it is going at the same speed as the car and therefore is still relative to the car. there is no force acting on it to make it behave otherwise.  that's why you don't feel anything in a car unless you're accelerating or decelerating. so you feel like you're pushed forward when the car is coming to a sudden stop. because then there's a force stopping the car, and therefore you, so you feel it. in this case, the fly would also go flying(no pun intended) to the front of the car.\n\nif this is still unclear, think of the earth. the earth is rotating with a speed of over 1000 m/s, but you don't feel it. that's because you're moving at that same speed, you're stationary relative to the earth so you feel stationary because your frame of reference is the earth.