If you're on a moving vehicle such as a train and you jump into the air, do you land in the same spot?

Answer 1

Sorry I have to say this, but you do not have the same momentum as the train. Momentum is mass times velocity. While you are going the same speed as the train (velocity) you hardly weigh the same (well some might.)

Anyway, the correct answer is that the difference between where you land and where you jump will be so minuscule that it doesn't matter. Your inability to place your in the exact same position as when you jumped will make a bigger difference than air drag. Besides, if you are inside a train, the air is moving with the train too, not against you.

Try jumping in front of a fan and see if you land in the same spot.

Answer 2

The very important question here is whether you are inside or outside the train (or other vehicle).

If you are inside the train, before you jump the train, yourself, and the air, are all moving at the same speed. So without any force acting on you to slow you down, you will continue to move forwards relative to the ground while you are in the air, and will land in the same spot. i.e. if you are travelling at 4m/s relative to the ground, and it takes 1 sec for you to land after the jump, then you, and the train, and the air will have all moved forwards by 4m, and so you will land in the same spot.

If you are outside the train then the air is (assuming no wind) stationary. The air therefore exerts a force on you (air friction, also called drag). So when you jump up, the air will slow you down a bit. So if you and the train are travelling at 4m/s, you jump up and land a second later, then your average speed while in the air will be less than 4m/s (let's for argument's sake call it an average of 3m/s), then you will land back down the train from where you took off (4-3=1m back down the train in our example).

That make sense?

Answer 3

I think of Einstein. Relative to what?

The train, yes, and you will travel twice your jump hight, but with no displacement.
The Earth, no, traveling the parabolic curve discribed with X the train displacement and Y as before from the jump. Displacement distance will be only by the trains motion.

I just had a look at some of the others. If by on the train you mean IN the train, the air and you move with the same verlocity of the train, so jumping up will not mean you land in a different spot (as long as the train matains its current verlocity, no speed or direction change). If you're Actually ON then the air would slow you down.

Answer 4

It depends what you mean by the same spot and the conditions under which you are jumping.
Let's assume you are inside a carriage rather than an open truck. There will be no wind resistance. You will land on the same spot in the carriage.
To an observer outside measuring your position relative to the track you will have moved.

If you think about it the train is never 'stationary' even when stopped because the earth rotates at about 1000mph. So from the perspective of an observer in space the staionary train is moving. Do you land on the same spot?

Answer 5

Yes

You have a certain momentum or speed moving you forwards, which is exactly the same speed as the train.

When you jump upwards you will continue at this forward velocity until something stop yous. Inside a train there is nothing to slow you down so you will hand on the same spot.

Outside the train, the air will force you to slow slightly, so when you land the train will have moved away from you by a certain amount.

Answer 6

Inside a carriage - you jump up, you fall down in the same place.

Outside the carriage - when you jump up, yes you are travelling at the same speed as the train, but the moment you leave contact with the train then you will begin to differ. The amount you differ depends on;

1. the speed the train is travelling at, ie. the faster you go the greather the air resistance acting in the opposite direction of the trains movement.
2. any other force acting up on you, caused for example by a cross wind.
3. and finally the height and velocity you jump with, the higher you jump the greater the difference will be, but as we are largely resticted to the capailities of the human body then any huge difference is impossible to acheive without mechanical help.

Answer 7

As the moving body (the vehicle) and you have the same momentum and you jump upwards you are carried forward in real world coordinates, but you will land on the same spot on the train.
If you could jump high enough/long enough then as you are not providing energy your momentum will slow due to friction. thus if you could stay in the air long enough (which you cant) then eventually you would get to a state where you would land behind the spot you jumped.

However if you take a running jump your momentum would be greater than the vehicle and you would land in a position forward to where you started.

Answer 8

Actually, it all depends on several variables.

If you're in a passenger car or a box car it really doesn't matter how fast or slow the train is moving, you're going to land very close to the same spot if you jump straight up and that's because you have built up a forward momentum that matches the train's.

If you're dumb enough to go on top of a moving train like I did when I was young (my brother, our friends and I use to ride freight trains, and we would run across the top of them jumping from one car to the next) you could end up further away from away from where you started, especially on a windy day.

Finally, there's the last one. If you were to stand on the end of a flat car that is at the end of a moving train and you were to jump straight up in the air, there's a good chance you will not only miss landing on the train car again, but you will probably end up hitting your chin on a part of the train as it leaves you behind (it's called Murphy's Law). We never tried this one, but I have jumped off of a lot of moving trains.

Once I got older and graduated from H.S. I got a job working at a place where we re-build locomotives, and I finally got to drive them!

Answer 9

If you jump up into the air on a moving planet, will you land in the same spot? The Earth is moving, so of course you know you will. If you tossed a ball straight up in the air as you are walking, it will come straight back down for you to catch. Someone watching from the other side of a wall high enough to hide you from their view but that still allowed them to see the ball in the air might think someone was just tossing it to another person. To him, it followed a curved path. If you jumped while you're on the moving train, even though you landed in the same spot on the train's floor, an observer on the ground would see you land a few feet ahead of where you started in relation to points on the ground. From your point of view, you went straight up and down, but the observer, in his different frame of reference, saw you travel a curved path relative to the ground. Relative? The magic word! This is the very simplest example of what Einstein was talking about. Motion is relative to your point of view.

Answer 10

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