Traveling at the Speed of Light

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SUMMARY

The discussion centers on the concept of mass increase as an object approaches the speed of light, as described in Stephen Hawking's "A Brief History of Time." It is established that while a traveler does not observe a change in their own mass, the energy input required to accelerate the object increases significantly, leading to an effective increase in inertia. This phenomenon occurs because, as speed approaches light, energy input contributes to the object's mass rather than its velocity, making further acceleration increasingly difficult.

PREREQUISITES
  • Understanding of Einstein's theory of relativity
  • Basic knowledge of kinetic energy and inertia
  • Familiarity with concepts of mass-energy equivalence
  • Awareness of the speed of light as a universal constant
NEXT STEPS
  • Research Einstein's theory of special relativity in detail
  • Explore the implications of mass-energy equivalence (E=mc²)
  • Study the concept of inertia and its relation to acceleration
  • Investigate the limitations of particle acceleration in physics
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in the fundamental principles of relativity and the nature of mass and energy in high-velocity contexts.

Andrewjh07
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In A brief History of Time, Hawking says that it is impossible for us to go the speed of light because if we were able to go that speed our mass would be infinite...or something like that. Is it really just as simple as that? Or was there something I misunderstood? Sorry if it is a dumb question...I am a first time poster. Thanks!
 
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So put simply, as you move faster, your mass becomes bigger? Why is that?
 
Andrewjh07 said:
So put simply, as you move faster, your mass becomes bigger? Why is that?

No, as the traveler you observe no change in mass.
 
because it would take an infinite number of energy to make that happen.
 
A simple explanation of why "mass" increases as your speed approaches the speed of light is this:

To make thing simple, let's just accept that nothing can move faster than the speed of light. So imagine you are putting a constant amount of energy into an object to make it go faster. Of course, eventually you get close to the speed of light, but you cannot keep speeding up indefinitely or else your speed would exceed that of light! But, you are still putting in energy at the same rate. So, where does the energy you are putting in go? Effectively, it goes into the inertia, or mass, of the object, making it progressively harder and harder to increase it's velocity with the same amount of energy.
 

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