Hooke's Law

Physical Law
Hooke's Law applies to an ideal spring:


 * $\mathbf F = -k \mathbf x$

where:
 * $\mathbf F$ is the force caused by a displacement $\mathbf x$
 * $k$ is the spring force constant.

The negative sign indicates that the force pulls in the opposite direction to that of the displacement imposed.

Also see

 * Dimension of Spring Force Constant: the dimension of $k$ is $M T^{-2}$.