What apparatus is needed for investigating Hooke's law? A steel spring, a 100g mass hanger, 12 x 100g masses, a retort stand, a boss and clamp, a clamp, a metre rule, an s-hook, a pointer, safety ...

Hooke’s Law is obeyed up to the limit of proportionality. Beyond this point, stretching force and extension are no longer directly proportional and the graph begins to curve.

A Hooke's Law Spring How do you know if a spring acts like it is supposed to? The simplest way is to hang a spring and add weights to the end. Like this.