Today we have been working on a lab practice with dynamometers to compare the concepts of mass and weight.

Did you know that dynamometers follow Hooke's law? This law says that the extension of a spring is proportional to the load applied to it.

The length of a spring always changes by the same amount when it is pushed or pulled. The equation for that is:

*F = k·x*where

F is how much (push or pull) is on the spring

k is a constant, the stiffness of the spring.

x is how far the spring was pushed or pulled

When x = 0, the spring is at the equilibrium position.