下面为大家整理的是以字母U开头的SAT2物理考试中常用词汇。掌握一定的物理词汇是备考SAT2的首要前提。所以，各位考生一定要多加重视词汇的积累，预祝各位考生考试成功。

U

Uncertainty principle

A principle derived by Werner Heisenberg in 1927 that tells us that we can never know both the position and the momentum of a particle at any given time.

Uniform circular motion

The motion of a body in a circular path with constant speed.

Unit vector

A unit vector is a vector with length 1.

Universal gas constant

Represented by R = 8.31 J/mol · K, the universal gas constant fits into the ideal gas law so as to relate temperature to the average kinetic energy of gas molecules.

以上就是关于SAT2物理考试常用词汇的全面内容，是以U开头的。各位考生可以作为备考时的参考资料，希望对各位考生的SAT2考试有所帮助。

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