Frank L. H. Wolfs
Department of Physics and Astronomy, University of Rochester, Slide 41
The limitations of special relativity.
Yes É Einstein had problems too!
¥Special relativity could only be used to describe anything involving motion in a straight line with constant velocity.
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¥The special theory of relativity could not be applied to situations involving forces, such as electromagnetic forces or the force of gravity, since they seldom involve motion in a straight line with constant velocity.
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¥Einstein was able to show that no simple modification of the special theory of relativity could fix these problems.  A new theory was required:
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¥The General Theory of Relativity