Undergrad 2as = v^2 an other equations dealing with the past

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SUMMARY

The discussion centers on the equation 2as = v^2 and its validity in both classical and relativistic physics. Participants assert that while the equation is often presented without context in educational materials, it remains applicable within its domain, particularly in classical mechanics. The distinction between initial velocity (v0) and final velocity (v) is emphasized, highlighting that both forms of the equation are valid under specific conditions. The conversation underscores the importance of understanding the limitations and applicability of classical physics equations in modern contexts.

PREREQUISITES
  • Understanding of classical mechanics concepts, particularly kinematics.
  • Familiarity with the SUVAT equations (s = ut + 1/2 at², v = u + at, etc.).
  • Basic knowledge of relativistic physics principles.
  • Ability to differentiate between initial and final velocities in motion equations.
NEXT STEPS
  • Research the derivation and applications of the SUVAT equations in classical mechanics.
  • Study the implications of relativity on classical physics equations.
  • Explore the historical context of physics education and the evolution of teaching methods.
  • Investigate experimental evidence supporting the validity of classical equations in real-world scenarios.
USEFUL FOR

Students of physics, educators in the field of classical mechanics, and anyone interested in the relationship between classical and relativistic physics will benefit from this discussion.

spino
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2as = v^2 but why do they have the formula 2as = v^2-vo^2 displayed as correct without a reference that its wrong. In Basic physics classes it may not even be mentioned that its wrong. I understand that no one is teaching relativistic physics but why not even mention it. Its been over a 100 years and its still being used in physics books today as being correct along with other formulae dealing with the past.
 
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https://chem.tufts.edu/answersinscience/relativityofwrong.htm
 
What is your question? Newton's physics is good enough to cover most of all real world problems. As it is easier, it doesn't make sense to calculate the movement of a car relativistic. It's not measurable.
spino said:
but why not even mention it
It will be mentioned where it is relevant.

If you meant the difference of the term ##v_0##, then this is the difference whether there is an initial velocity before acceleration starts or not. Both are valid for certain cases.
 
spino said:
its still being used in physics books today as being correct along with other formulae dealing with the past.
It is still being used because it is still correct within its domain of applicability, as shown by a mountain of experimental evidence.

Edit: actually, the suvat equations are exactly correct, even in relativity.
 
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