Space travel, mass increase, and length shorteneing

In summary: , and the length contraction is backwards, because when something moves faster, its length decreases, because you are seeing it from a different perspective...sorry for the long answer.
  • #1
Masest
12
0
Alright, i have a final and i have to explain just three parts to einstein's theory of relativity... they are space travel (time slowing nearing the speed of light), increase of mass with speed, and length contraction... the space travel makes no sense, and the mass one, i have mixed feelings about... i know that mass is the amount of matter something has, but as somethign speeds up, it gets more matter? it doesn't make sense... and the length contraction seems backwards too... normally when you see a car fly by really fast, it looks a little longer... man if i were einstein, then i would know, but seeing as how i am just in high school, it doesn't make to much sense... please help
 
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  • #2
Masest said:
Alright, i have a final and i have to explain just three parts to einstein's theory of relativity... they are space travel (time slowing nearing the speed of light), increase of mass with speed, and length contraction... the space travel makes no sense, and the mass one, i have mixed feelings about... i know that mass is the amount of matter something has, but as somethign speeds up, it gets more matter? it doesn't make sense... and the length contraction seems backwards too... normally when you see a car fly by really fast, it looks a little longer... man if i were einstein, then i would know, but seeing as how i am just in high school, it doesn't make to much sense... please help

the problem is that you don't have the right definition of mass. it isn't the quantity of matter, that's the mole. mass is just an intrinsic property of matter. Even the new generation of scientist don't know anything about mass. (see higgs boson).
You have to understand that formula in this way: No physical system with a mass M different from zero can reach the speed of light c. Otherwise you need an infinite amount of energy.
In any case i think you are confusing the rest mass Mo which is always the same and the relativistic mass M=Mo/sqrt(1-beta^2). what remain constant and gives you the conservation (lorentz invariant) is the square of the 4 momentum. which is
p^2 wher p=(E,P) P is the common 3-dim momentum.
 
  • #3
im sorry i have just check your ID.
i think that what i have told you in the last part is a little bit too much 4 high school.
well in any case try on wikipedia maybe it can be more clear.
especially it is written in english. i think i cannot comunicate in this language as well as in italian.

bye
marco
 
  • #4
lol... it is fine... i think i am starting to get it... there are two mass types... one is relativistic, moving mass, and the invarient mass is resting mass... i think i found out the spave travel one... time slows down relative to you because your body adjusted to that speed, and that is going to be normal speed for you, and your heartbeat will adjust to it too... relative to people on earth, you are moving very fast (ver very very fast XD) and there body is set for that speed... so ten minutes to you is going to be like three months to them... the mass is going to increase, the relativistic mass, because i think that the force needed to push it using the equation F=MA will increase, and the acceleration will stay the same, therefore making the mass have to increase
 

What is space travel?

Space travel refers to the act of traveling through outer space, typically with the use of spacecrafts. It allows humans to explore and study the vastness of the universe beyond Earth.

Why does mass increase in space travel?

Mass increases in space travel due to the effects of relativity. As an object approaches the speed of light, its mass increases. This is known as relativistic mass and is a result of the object's energy increasing as it gains speed.

How does length shorten in space travel?

In space travel, length shortening is also a result of relativity. As an object approaches the speed of light, its length in the direction of motion appears to shorten. This is known as length contraction and is a result of time dilation.

What are the challenges of space travel?

Space travel presents many challenges, including the high cost of technology and resources, potential health risks for astronauts, and the difficulty of navigating through the harsh conditions of outer space. Additionally, the vast distances and time required for interstellar travel make it a difficult feat to achieve.

What are the potential benefits of space travel?

Space travel has the potential to greatly advance scientific knowledge and technological advancements. It allows for the exploration and study of other planets and celestial bodies, which can provide valuable insights into the origins of the universe and potential for sustaining life. Space travel also has the potential to facilitate the development of new technologies that can improve life on Earth.

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