Newton's Second Law of Motion is concerned with the effect that unbalanced forces have on motion.
An unbalanced force acting on an object causes it to accelerate. There are two points to note about the acceleration of an object when an unbalanced force acts on it.
Newton's second law provides a relationship between the unbalanced force on the object, the mass of the object and the acceleration that is produced. The amazing thing is that the relationship can be expressed neatly by a straightforward mathematical equation.
The unbalanced force is measured in Newtons , the mass is measured in kilograms and acceleration a is measured in metres per second per second .
Learn how forces make things move.