The tools and animations on this page allow you to perform relativistic calculations and to illustrate thought experiments at high speeds. The aim is to give the user a better familiarity with relativistic mechanics from a quantitative point of view.
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Use this tool to convert energy expressed in certain units into other energy units. It’s easy to use. The prefix for the energy units ranges from “Yokto = 1.0e-24” to “Yotta = 1.0e+24”.
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Use this tool to calculate relativistic quantities depending on the speed, such as Lorenz factor, length contraction and frequency shift. The speed is given in absolute values between -1 and 1, as a fraction of the speed of light.
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Relativistic Energy Calculator
Use this tool to calculate the energy of physical bodies at any speed. If you want to know the kinetic energy of an electron at 99.3% of the speed of light or how much the mass of a proton changes at the same speed, then this is the right tool for you.
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At this link you can view animations that illustrate the thought experiments of the book “Newton and Relativity”. Each animation relates to a specific chapter.
