Recent content by physicsisfeyn

  1. P

    Derivative of energy is force?

    Okay. So am I wrong in thinking that mass increases with speed? If so, what happens when you approach the speed of light? If you're right at the barrier, say .9999c, and you double the force, what happens?
  2. P

    Derivative of energy is force?

    Why is the derivative of energy force? For example: KE=1/2mv^2 the derivative of which, assuming mass is held constant is KE'= ma. Why is this? What is the significance of this? What are some applications of this? Additionally, Einstein's famous equation, E=mc^2, relates mass with energy. Does...
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