Speed of light and mass increase

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SUMMARY

The discussion centers on the relationship between mass, propulsion, and acceleration as described by the theory of relativity. It is established that as the mass of an object increases, greater propulsion is required to achieve acceleration, particularly as velocity approaches the speed of light (c). The concept of relativistic momentum is crucial, as it modifies the traditional momentum equation (F=dp/dt) to account for the effects of relativity. Additionally, while a vacuum reduces resistance, inertia remains a significant factor in propulsion.

PREREQUISITES
  • Understanding of Einstein's theory of relativity
  • Familiarity with the concept of relativistic momentum
  • Basic knowledge of Newton's laws of motion
  • Comprehension of acceleration and its relationship to force
NEXT STEPS
  • Study the implications of relativistic mass increase on propulsion
  • Learn about the equation E=mc² and its relevance to energy and mass
  • Explore the concept of inertia in both classical and relativistic contexts
  • Investigate the effects of friction and resistance in different environments
USEFUL FOR

Physicists, students of physics, and anyone interested in the principles of relativity and their applications in understanding motion and force.

Vals509
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why is it that as the mass of a body increases greater propulsion is needed to move it, according to relativity. i thought that in a vacuum, an object is a lot easier to propel.
 
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With greater propulsion you mean acceleration? I don't see what this has to do with relativity. Do you mean that E tends to infinity when v approaches c for an object with mass?

A body whether in vacuum or on Earth still has inertia. F=dp/dt still holds even in relativity, although you will need to use relativistic momentum for p. The advantage of vacuum is the lack of resistance, like friction, which makes it easier to accelerate.
 

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