Newton's Second Law of Motion

Here we discuss about Newton’s 2nd Law of Motion.

Newton’s 2nd Law tells us that how a body behaves when there is not net force acting on it. The Newton’s 2nd Law states that:

“The effect of an applied force on a body is to cause it to accelerate in the direction of Force. This Acceleration is directly or positively related to applied force and negatively or inversely related to mass of the body”.

So, we can say that, New Second Law of Motion tells us that when we apply force to a body at its rest position, it will start to move in the direction of applied force till the end of applied force.

Assumptions of the Law:

1. Suppose we apply force on a body that is moving in a straight line, then it will accelerate it velocity and the body will move as long as the force in in action.

2. If we apply the force on a body in the direction opposite to its motion, then the body will accelerate at low speed. If the applied force still continues in action, then the body will stop for a while and then move with an increasing velocity in the direction in which the force is being applied.

3. The Law also assumes that if the force is applied to a moving object in opposite direction, the acceleration of the body will still in the direction of applied force.

Equation of Newton’s Second Law

Mathematically, we can write Newton’s Second Law as:

F = ma

Here F is the net force applied on the body, m is the internal mass of the body and a is the acceleration of the body affected.

In the above equation F and are the Vector units while m is a scalar quantity.

In the form of Units, we write the above equation as:

1 Newton = 1kg X 1m/s²

The above equation shows that 1 Newton force applied to a body of mass 1kg and accelerated the body with 1m/s².