Newton's second law of motion explains how an object will change velocity if it is pushed or pulled upon.

      Firstly, this law states that if you do place a net force on an object, it will accelerate, i.e., change its velocity, and it will change its velocity in the direction of the force.

     Secondly, this acceleration is directly proportional to the force. For example, if you are pushing on an object, causing it to accelerate, and then you push, say, three times harder, the acceleration will be three times greater.

     Thirdly, this acceleration is inversely proportional to the mass of the object. For example, if you are pushing equally on two objects, and one of the objects has five times more mass than the other, it will accelerate at one fifth the acceleration of the other.

Definition Provided by Zonalanded Education