A spring scale measures force , usually the weight of an object. In everyday use, that means it tells you how hard gravity is pulling on something, and it is often shown in newtons or sometimes grams on classroom scales.

Quick Scoop

A spring scale works by stretching a spring: the more force applied, the farther the spring extends. That stretched distance is then converted into a reading on the scale.

What it means

  • Primary measurement: force or weight.
  • Common classroom use: measuring the weight of an object.
  • Related concept: it relies on Hooke’s law, where stretch increases with applied force.

Small distinction

People sometimes say a spring scale measures mass, but strictly speaking it measures weight or force; some scales are calibrated to display mass-like units for convenience.

TL;DR: a spring scale measures the force pulling on an object, usually its weight.