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Einstein described that if a rock falls from someone on a train down the ground outside the train then it would appear to the person on the train as falling in a straight line - but it would appear to the person on the ground watching the train as a parabola. That is because the person on the ground isn't moving, and the train is moving away from the person (so they see it from different angles). Air resistance makes the rock move in a parabola - the train is moving fast so when it drops it goes in a parabola. The person on the train simply sees it from an angle that doesn't reflect the entire nature of the parabola - if you look at some things from only one angle you might not be able to see everything that is going on. If you look at something from all angles so you can account for its movement in all three dimensions.

Time would be the same from both perspectives only the speed of the objects for both people would be different relative to how fast they were traveling. If one person is travelling fast then it is moving at a different speed relative to that person, so the person would be travelling faster away but the speed of the object could be viewed as being two speeds because everything in the universe is moving relative to something else.

The gravitational field

If the brakes are applied to the train, then the train stops and the person experiences a sudden jerk forward.

The person jerks forward because of gravity - the friction of the wheels of the train are influenced differently by gravity than the person sitting on the seat. The person is not pinned down to the seat, so his force is not stopped as well as the force of the train is stopped.

Gravity helps to determine the force of friction on the wheels of the train, and considering the speed of the train and the person on the train (which are the same before the train starts to stop) the train simply stops faster than the person because the persons motion is harder to stop because it is only the train that stops. If different elements of the body that is stopping its motion (like the element of the person in the train and the body of the train, or perhaps something else that is loose in or part of the train) stop at different times then they are going to move separate from the other different elements, and appear disjointed.

My ideas about the nature of time

Time is only measured based upon what can be observed changing in a certain period of time. Some things move faster than other things, and if you take into account how everything moves at different speeds then everything can be changing relative to a 'normal' constant.

But what would be moving at a normal speed? How could someone define 'normal'? Everything on the earth moves relative to the ground of the earth, but the entire earth is spinning. So everything could be 'normal' compared to the center of the earth, or other places on the earth and how things are moving there - that is how time and speed on earth is measured and compared and contrasted - and that is because everyone on the earth is only on earth and we don't really care very much about stuff outside the planet - because people live on the ground of the planet.

So what would be a 'normal' speed? Everything moves relative to something else. That is what reality is about - physical objects that move in a certain pattern, sometimes the pattern is organized, and sometimes it is chaotic.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Consciousness, emotion and cognition. OpenStax CNX. Jul 11, 2016 Download for free at http://legacy.cnx.org/content/col11886/1.5
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