Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the mass of the object.

Mathematically, it can be expressed as:

```

F = ma

```

where:

* F is the net force acting on the object (in Newtons)

* m is the mass of the object (in kilograms)

* a is the acceleration of the object (in meters per second squared)

In simpler terms, the second law states that the more force applied to an object, the greater its acceleration will be. Conversely, the more massive an object is, the less its acceleration will be for a given force.

This law is fundamental to understanding the motion of objects and is used in a wide range of applications, such as engineering, sports, and space exploration.