The measure of how hard gravity is pulling on an object is called weight.

Here's why:

* Gravity: A force that attracts objects with mass towards each other. The more massive an object, the stronger its gravitational pull.

* Weight: The force of gravity acting on an object's mass.

Think of it this way:

* Mass: The amount of matter in an object (doesn't change with location).

* Weight: The force that makes an object feel heavy (changes with location, especially on different planets with different gravitational forces).

So, while gravity is the force itself, weight is the specific measurement of how much that force is acting on a particular object.