Why Flies Can Fly Freely in Moving Cars

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Flies can fly freely in moving cars because they are flying relative to the air inside the vehicle, which is moving at the same speed as the car. This principle is similar to how passengers can breathe comfortably in a car traveling at high speeds, while sticking their heads out the window results in discomfort due to the wind resistance. The discussion highlights the concept of relative motion, illustrating that the fly's movement is unaffected by the car's speed. The term "Galileo's Boat" is suggested for further exploration of this concept. Understanding these principles clarifies why flies can navigate within a moving vehicle without issue.
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why they can fly freely in the car without hitting the rear no matter how fast the car is going forward?
 
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Welcome to PF, Custer.
The fly is flying relative to the air within the vehicle, which is moving at the same speed as the vehicle. For pretty much the same reason, you can breathe freely in a car going at 200 kph; try sticking your head out of the window at that speed, and you'll find yourself breathless.
 
Then now you're traveling in the speed of over 200 meters per second(I assume that you live in some particular places on the surface of the earth), you're not feeling anything uncomfortable, right?
That's almost the same.
If you're interested, you can check the term"Galileo's Boat".
 

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