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 Forum index » TSGK General » General Discussion
an interesting question
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Lawitz
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PostPosted: Wed Jul 16, 2008 00:48    Post subject:  an interesting question  
when you jump up in a bus, car, or plane you end up landing on the same place again because the windows stop the air inside from moving. but there are busses with open upper decks, what happens if you jump up there? if the bus does move forward, how much would it move at a speed of 50km/h / 31m/ph and at 100km/h / 62m/ph while you are 0.5m in the air? ok thats too complicated, but would it actually be dangerous?

this question has been on my mind for some time now and I need an answer.
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Diet H2O_TSGK
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PostPosted: Wed Jul 16, 2008 01:03    Post subject:  
Eh no. The windows being open or closed has nothing to do with it. It's momentum.

You're on a bus. You and the bus are moving at 50 km/hr. You jump up vertically but you are still moving horizontally (because of your momentum) at approx 50 km/hr. Hence you don't go crashing into the back seat of the bus. Put another way - if you jumped off the bus yyou would land on the ground but because you were travelling at 50 km/hr you'll land, break your ankle, roll forward along the buses direction for 20 metres, and suffer serious head injuries. Try it! Very Happy

The fact that there is air on an open deck bus will only slow you down a bit because of friction.
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Lawitz
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PostPosted: Wed Jul 16, 2008 01:13    Post subject:  
thanks Diet Einstein Laughing
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Freelancer
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PostPosted: Wed Jul 16, 2008 06:52    Post subject:  
Diet H2O_TSGK wrote:
Eh no. The windows being open or closed has nothing to do with it. It's momentum.

You're on a bus. You and the bus are moving at 50 km/hr. You jump up vertically but you are still moving horizontally (because of your momentum) at approx 50 km/hr. Hence you don't go crashing into the back seat of the bus. Put another way - if you jumped off the bus yyou would land on the ground but because you were travelling at 50 km/hr you'll land, break your ankle, roll forward along the buses direction for 20 metres, and suffer serious head injuries. Try it! Very Happy

The fact that there is air on an open deck bus will only slow you down a bit because of friction.
actualy i managed to jump from a Hammer and not break anyting except tthe diner i landed in Laughing
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Osiris_TSGK
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PostPosted: Wed Jul 16, 2008 09:05    Post subject:  
Diet H2O_TSGK wrote:
Eh no. The windows being open or closed has nothing to do with it. It's momentum.

You're on a bus. You and the bus are moving at 50 km/hr. You jump up vertically but you are still moving horizontally (because of your momentum) at approx 50 km/hr. Hence you don't go crashing into the back seat of the bus. Put another way - if you jumped off the bus yyou would land on the ground but because you were travelling at 50 km/hr you'll land, break your ankle, roll forward along the buses direction for 20 metres, and suffer serious head injuries. Try it! Very Happy

The fact that there is air on an open deck bus will only slow you down a bit because of friction.

Yes and also, 2 others factors, how long you stay in the air during your jump and at which speed you do jump outside the buse going at its opposite side of motion.

First factor, you will indeed land away from you orginal position the more you stay in the air, because your fictitious force is provided by being in contact with the buse (as you'r not in motion by yourself), so as soon you aren't in contact with it you then reduce your fictitious force and your traveling speed, unnoticable for the buses example because too short in time (best exemple, NASA no gravity simulation, they just make a plane falling down at a certain speed, so passengers will float in the air if they aren't in contact with a part of the plane, and if the plane doesn't fall down faster or slower than their body does).
Also, it is about earth gravity+atmosphere, in the space it would be different, no gravity, no friction.

As Diet mentionnned the fact that the buse wouldn't have a top will be a friction issue, could be increased or decreased depending if it is a windy day and on which direction the wind is blowing, so no wind, wind air speed = speed of the buse, so if the buse is running at 130 km/h it could be dangerous execpt if there is a blowing wind of 130 km/h coming from its tail, then no friction because they will cancel each others.

And if you are going to jump from anything in motion, all you have to do is to jump the opposite side of its motion at the same speed (or a bit faster), you would then cancel the fictitious force provided by the buse while landing on the ground.
So, if you jump from a buse running at 50 km/h, and considering that you can run at a max speed of 25 km/h, then you will land on the ground at the speed of 25 km/h opposite of your runing direction (less infact), so you will rolldown backward, if you can manage to run at 50 km/h you will then cancel the fictitious force and land on your feet (well not really because while jumping you lost a bit of the opposite fictitious force that you provided as soon as your feet aren't in contact with anything).

Well, yes, i did ask myself about this already long time ago...
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Wonderbanana


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PostPosted: Wed Jul 16, 2008 10:16    Post subject:  
I klove questions like this Very Happy But it's far too early in the morning Wink My brain hurts Laughing
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Shimmy_TSGK
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PostPosted: Wed Jul 16, 2008 10:33    Post subject:  
I think what Diet and Osiris said sums up everything.

in summary, the 0.5 meter jump is so negligible that the change in momentum due to loosing the sustained acceleration of the bus and coupled with the negligible force of the wind would only produce a negligible change in position upon landing.

this reminds me of high school... ahhh.. the nightmares...
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Freelancer
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PostPosted: Wed Jul 16, 2008 23:36    Post subject:  
Shimmy_TSGK wrote:
I think what Diet and Osiris said sums up everything.

in summary, the 0.5 meter jump is so negligible that the change in momentum due to loosing the sustained acceleration of the bus and coupled with the negligible force of the wind would only produce a negligible change in position upon landing.

this reminds me of high school... ahhh.. the nightmares...
My "Smat" English comprehands this , thank you Shimmy for makeing it shorter and READABLE for a peasant like me ^^
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Xmeagol
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PostPosted: Fri Jul 18, 2008 01:17    Post subject:  
._.
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StonedCabbage
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PostPosted: Fri Jul 18, 2008 01:25    Post subject:  
also, if you walk from the bottom width of the bus to its top width, you're traveling faster than the bus, so techincally were going 54kph Very Happy
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Xmeagol
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PostPosted: Fri Jul 18, 2008 13:25    Post subject:  
what about wind resistance?
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StonedCabbage
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PostPosted: Fri Jul 18, 2008 14:25    Post subject:  
It should be marginal unless the bus happens to be travelling through this at the time: -


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mob_2111

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PostPosted: Wed Jul 23, 2008 18:42    Post subject:  
i just love physics class

especially when we get to throw things
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EVIL EDNA

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PostPosted: Wed Aug 13, 2008 00:33    Post subject:  
You guys have way to much time on youre hands. Anyway try jumping in an elevator/lift just as it begins to move, depending on the speed of the lift you can get a bit of height. Laughing
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DeezNut$


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PostPosted: Wed Aug 13, 2008 12:23    Post subject:  
StonedCabbage wrote:
It should be marginal unless the bus happens to be travelling through this at the time: -



LOL
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