Here, k is called the spring constant and represents how stiff the spring is. The value s describes how far the spring is stretched or compressed from the equilibrium position.

The spring constant shows how easy or hard it is to stretch a spring, for example a spring with a spring constant, k = 4 N/cm means a force of 4N is required to stretch the spring by 1 cm.

A physics video claims rubber bands don't act like springs. But is that true? Dot Physics blogger Rhett Allain tests the notion with a few custom contraptions.