**Use in Physics**

Time derivatives are a key concept in physics. For example, for a changing position, its time derivative is its velocity, and its second derivative with respect to time, is its acceleration. Even higher derivatives are sometimes also used: the third derivative of position with respect to time is known as the jerk. See motion graphs and derivatives.

A large number of fundamental equations in physics involve first or second time derivatives of quantities. Many other fundamental quantities in science are time derivatives of one another:

- force is the time derivative of momentum
- power is the time derivative of energy
- electrical current is the time derivative of electric charge

and so on.

A common occurrence in physics is the time derivative of a vector, such as velocity or displacement. In dealing with such a derivative, both magnitude and orientation may depend upon time.

Read more about this topic: Time Derivative

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### Famous quotes containing the word physics:

“... it is as true in morals as in *physics* that all force is imperishable; therefore the consequences of a human action never cease.”

—Tennessee Claflin (1846–1923)