How to explain Theory of Special Relativity?

In my essay I have to explain Einstein's Theory of Relativity in a way that anyone can understand it. It can't be that long either. About 30 or 40 words. Can someone help me explain the theory in a easy way?





Thanks|||Observe a ball falling when left through a car moving with uniform velocity.you will observe its motion to be linearly downwards.Now let us observe this ball from outside.You will observe its motion to be projectile.this theory says that both the observers have right opinion.No one is wrong.In other words, all the frames of references are equal in the description of all physical laws.|||SRT in 30 or 40 words - "Einstein's Special Relativity Theory (SRT) explains the motion of moving bodies with respect to one another." In a nutshell that's it. (General Relativity gets really complex and mathematically heavy and adds gravity to the mix.) Now, there's a lot more to the theory if you consider what Einstein is really trying to do with these moving systems, how he derived his equations, and how he reaches his orginal conclusions. In order for SRT to make sense, you have to understand concepts like "time dilation" and "length contraction," which are essential to SRT.





I'm a contrarian when it comes to SRT. However, I explain how Einstein arrives at his theory (as derived in his 1905 paper and in his Relativity book) and have prepared a set of 4 video clips that explains moving systems. The 4th video explains SRT and the key assumptions you have to make, and why if you make those assumptions you must accept concepts like time dilation and length contraction. (Although, you should probably watch all 4 so that you understand the terminology I use.) You can see these short videos at my blog at http://blog.relativitychallenge.com - Episodes 12 through 15.





Good luck with your essay.





Steven|||the whole theory in 30 or 40 words? wow...





motion is relative, no point of view is better than any other and either can be correct. a stationary observer sees time slow down for an object moving very fast. that same observer also sees that object contract, and get more massive. the observer moving very fast could argue that he was motionless, and everything else was moving. so he could same the same things about the stationary observer. nothing can travel faster than the speed of light.





good enough? i give you permission to copy that directly.