The force of an object pulling toward the center of a circular path is called centripetal force. It is directed towards the center of the circular path and is necessary to keep the object moving in a circular path. The centripetal force is provided by the tension in the string, the normal force of the surface, or the gravitational force, depending on the specific situation.

The formula for centripetal force is given by:

$$F_c = mv^2/r$$

Where:

- Fc is the centripetal force in newtons (N)

- m is the mass of the object in kilograms (kg)

- v is the speed of the object in meters per second (m/s)

- r is the radius of the circular path in meters (m)

This formula shows that the centripetal force is directly proportional to the mass of the object, the square of its speed, and inversely proportional to the radius of the circular path.