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Relativity loading

Relativity explains why any two objects moving at the same speed can interact with each-other as if they were standing still.

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Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
  • Interactive Simulations
    Black Hole

    Black Hole

    by CK-12 //at grade
    Watch a clock slow down in the strong gravitational field near the event horizon of a massive black hole.
    This indicates how strong in your memory this concept is
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