The strength of the gravitational force on Earth is not a single number, as it varies slightly depending on location. However, we can talk about the average gravitational acceleration on Earth's surface, which is:

9.81 meters per second squared (m/s²)

This means that for every second an object falls freely, its downward velocity increases by 9.81 meters per second.

Important Notes:

* This value is an average. Gravity is slightly weaker at the equator and slightly stronger at the poles due to Earth's shape and rotation.

* The gravitational force also depends on the mass of the object. The more massive the object, the stronger the gravitational force acting upon it.

Let me know if you'd like to know more about the factors affecting gravity on Earth!