Physics for IGCSE & O level - Forces And Pressure (Section 6 - No. 19)

What is the relationship between force and extension in Hooke's law?

The force and extension are always proportional.

The force and extension are only proportional within the elastic limit.

The force and extension are unrelated.

The extension and force can be in any direction.

Hooke's law describes a proportional relationship within the elastic limit.