A bus travelling at the speed of 80 kmph. A lady is having mangoes in her basket and there is a house fly?

Question

The house fly freely moves around the mangoes. The question is....
We are in contact with the bus. so we too will move with a velocity of the bus. no issues in that. But the fly which is not in contact with the bus at times flies freely in air. How is it possible. will the fly have velocity more than the bus. If it doesnt have greater velocity it will obviously hit the back glass of the bus. how the fly can move freely in a bus speeding with such a great velocity. hope you understand my question.

Answer 1

Let us suppose that this lady is traveling in an Air Conditioned Bus, i.e. there are no open windows. So, the air inside this bus is not in contact with the one outside. It means that there is no opposing force acting on the fly which is in contact with this air. The air inside this bus moves with the same velocity as the bus does(Does the air hit your face when you travel by a car whose windows are pulled up?). Therefore, the air is not stationery, 'cause if it would have been stationary, we would have been pushed behind. Theoretically speaking, the fly will be moving with the velocity of the bus with respect to a man standing on the road outside, but at the same time, it won't need to do any work to attain that velocity as it is in contact with the bus and it will obey Newton's First Law of Motion.

I believe this to be the appropriate reason. Please don't hesitate to correct me if it isn't.

Answer 2

The fly might crawl or sit up on the walls of the bus. So, the fly has now got the same velocity as that of the bus. After this, if the fly wants to fly freely, it will be able to do so without any problem for a short while. But yes, you are right, the fly entering the bus should have a greater velocity component in the direction of the bus' motion initially, but once it has come into the contact of any part of the bus' body, it forms a part of the bus-fly system & thus its motion (for a short time period) is along the center of mass of this system. But this too is valid for only a short while, 'coz if the fly loses contact with the bus for a longer time, its velocity will decrease considerably and it will need to regain to its lost velocity by coming into contact with a part of the bus again. That's why, if you observe carefully, flies perform an an intermittent motin, i.e., they crawl on the walls of a moving vehicle after flying for short time intervals.

Answer 3

the air trapped inside the bus (in which the fruit fly is flying) is also moving at 80 km. so the fly will not be swept away. his velocity has been generated by the acceleration of the bus (same reason you're going 80km.) However, if the bus driver rapidly applies the breaks the fly will move independently of the bus and will continue to move; smashing into the front windshield at 80km (discounting friction and movement of the trapped air). You can test this next time you're on the bus. Throw one of the mangoes straight up into the air when coming to a stop or accelerating and take note of it's path.

Answer 4

The fly moves with respect to the air around it. The air moves with the bus at the same velocity of the bus. The velocity of the bus adds to the velocity of the fly with respect to the ground.

Answer 5

When a bus moves, the air inside it is also moving, infact all the objects inside the bus are moveing along with the bus. Hence the fly appears to be stationary in relation to the bus and hence does not smash into the back glass.

Try a simple experiment, board the bus, carry a small ball with you. Throw it up in the air after the bus starts moving, does it fall back to u or does it smash the rear window? The same way it falls back to you, the fly also remains in sync with the bus.

Answer 6

That is why the flies pile up in the back of the bus and have to be cleaned out daily.

Actually the flie's inertia and "forward" motion of the inertia is what keeps him from splatting into the rear window. The air in the bus is also moving at the same speed of the bus, therefore in the fram of reference inside the bus, nothing seems to be moving while at the same time everything in the bus is moving at 80 kph.

Either that or the flies internal inertial dampers are keeping him suspended.

Answer 7

It is obviously a question of relative velocity. Why do you not think of the fly as a 'natural' aeroplane, programmed to fly around the things it loves!!

Think of the question in a broader way too! Think of the stars, moon, the sun, the universe-which Power is responsible for its organistion!!!!!!!! Then you will know how much we know!!

Answer 8

U r in touch with bus by feet if standing, by posture if sitting, but fly doesn't touch the bus when flies. I hope that u may understand my point.

Answer 9

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Answer 10

How do you walk and move around freely when the earth is rotating and revolving?