The magnitude of the centripetal force acting on an object traveling in a horizontal circular path will decrease and if the

The radius of the path is increased

Explanation:

The centripetal force is represented by the equation:

where is the centripetal force, is the mass of the object on the circular path, is its velocity and the radius of the circle

From the equation we can observe that the centripetal force and the radius of the circular path are inversely proportional: if the radius increases the force decreases, and if the radius decreases the force increases.

Thus, the complete sentence is:

The magnitude of the centripetal force acting on an object traveling in a horizontal circular path will decrease and if the radius of the path is increased

an obstruction