does a bird still have to keep flying if he enters a moving bus?

Question

its the same question put in a diffrent way.. if im standing in a moving bus, and i jump, will the bus below me keep moving and ill end up at the back. or will i end up at the same place. what ever the question is, i think its something to do with the earths rotation..or its probably a stupid question.

Answer 1

Very simply:

If he keeps flying at the same speed, he will be moving at his flight speed plus the speed of the bus.

If he stops flying, he will fall to the floor (or perhaps land a bit more gracefully than that), and be moving only at the speed of the bus (his flight speed has gone to zero).

If you jump in a bus, you continue to move forward at the same rate as when you were standing, so you land in the same spot on the floor. Of course, if the bus changes velocity while you are in midair, your motion will be different from its and you will not be in the same spot when you land.

The same goes for the rotation of the earth... the circumference of the earth is about 24,000 miles at the equator. Hence, at the equator, it is moving at about 1467 ft/sec. If you jumped and stayed in midair for 1 second, the earth would travel 1467', but you are travelling at the same rate and you would land in the same spot you jumped from.

Answer 2

It depends on which bird it is. A sparrow might require to flying as it has very less mass and the wind my blow it away. On the other hand if it is a vulture or any other which is heavy it might not require to do so.
If you jump on the same place (hop) you are sure end up in the backside of the bus. But if you leap forward by the time you touch the surface you won't go back.
It is not related to the earth's rotation nor is it a stupid question. It
is because the mass and the velocity of the bus and you being different the momentum of the bus is greater.
Momentum = Mass * Velocity. It's unit = kg metres per second square

Answer 3

first of all it is not a stupid question.

i will take the case of you jumping in the bus. when you are standing in the bus you are moving with the same speed as the bus . because of your inertia(momentum to be more precise) you will keep moving forward even while you jump up. so when you come down you will be in the same position from where you jumped.

now take the case of a flying bird(not inside the bus). Since it is moving forward with some speed, it also has momentum. it should continue to move forward infinitely with out any effort(wing flapping). but it has to flap its wings to counter the airfriction that tries to stop its forward motion. if there were no friction, the bird will move forward endlessly without any effort once it start moving. flapping the wings has another purpose also. it helps to keep the bird afloat in the air against the gravity.

now the flying bird has entered the bus. inside the bus the air is also moving forward. so bird will not have to put any effort to move forward against the air friction since the air too is moving with it. but it has to defy gravity to float and this will need flapping.
this is exactly similar to a helicopter hovering over the same point.

Answer 4

There are a whole lot of answers already. Some good and some not so good.

If we remember and apply some universal principles (laws) it will be easy to see what happens in a particular case.

In this case, we apply Galileo's principle of relativity, which can be stated as:

"The laws of motion are the same in all frames of reference that move at uniform velocity with respect to each other"

The Earth, and the Bus are two frames of reference. Let us assume the bus is moving with a uniform velocity with respect to the earth. (Which is not really always true, but good enough for a smooth ride!).

The laws of motion are the same in the two frames - so, without going into the details of HOW, we can say that whatever happens on the earth with respect to the earth, the same will happen in the bus, with respect to the bus.

In other words, what a person standing on earth will observe on the earth, is no different from what a person at rest in the bus will observe in the bus.The world will look and feel the same in both systems, for persons at rest, in the respective systems.

Easy?

Answer 5

To answer this question, you have to reaffirm your concept. As you know, in a moving bus you are actually moving at the same speed as the bus even though your feet might be still. Hence, despite jumping on the bus, you should still land in the same position.
To understand this better, think of yourself running and then jumping. You will find that if you can continue your run right after you land, you should reach a position after you land that is somewhere similar to a position you reach in the same time without jumping i.e. just carry on running.

HOWEVER, i cant be that sure if you are on a bus that is SO TALL and SO WIDE and you jump SO HIGH on a trampoline. Perhaps you will be slowed down by any form of wind you have inside and thus not reach your original position.

Hope this helps=)

Answer 6

No, he could perch on the back of one of the seats or hop about looking for crumbs.

I don't quite see how you jumping on the bus is the same question but here we go:

If you jump on the bus it will still keep going unless the driver stops it or she crashes while trying to stop you from jumping about. If the bus just keeps going you probably won't end up at the back unless you were very near there in the first place and actually jumped towards the back. It's really unlikely that you will end up in exactly the same place that you jumped from , even if you try but if you jump almost straight up and the driver doesn't swerve, accelerate or brake when you are in the air, then you and the bus will continue along at the same speed in the same direction so you will land in almost the same place you took off.

Are there no buses near where you live?

Answer 7

So long as the bird is in air,the bird will have to keep flying.
In your case when you jump and remain in air your velocity (force with which you were going ahead along with the bus will reduce whereas the bus will be moving at its own speed therefore you will to some extent will fall behind the place from where you jumped in the bus.The time you remain in air will decide the length of distance you will fall behind the place from where you jumped.It is sure if you have not kept hold any part of bus while jumping in air ,you wont land on the same place in the bus .

Answer 8

The bus becomes your datum of reference. If you jump in a bus, within the bus, you probably went up in a straight line and came down the same line. However to a person outside the moving bus, you moved in a curved trajectory and landed in the same spot within the bus, but in a different spot in the real world. i.e. when you jumped vertically, the bus 'launched' you frontwards as well, creating a horizontal component of motion.

Likewise for the bird, it has to keep flying within the bus to be there.

Answer 9

Yes the bird has to keep flying. And if you jump up on a moving buss you will go up, then come down in the same place.

You are at rest with respect to the bus. Your speed and its speed are the same.

It's not a stupid question at all.

Answer 10

yes it has to fly if it wants to fly inside the bus. Coz the bird has to fly with a velocity with what it has entered in the bus to maintain its position it has to fly. If it stops flying its velocity or movement will be stopped and still the bus is moving means it will get struck with the bus rear end. A little cosideration will help you to understand what i have told you.All your doubt arises due to relative motion between bird and the bus. It deals with Theory of relativity......

I think you maay able to understand what i have told...