# Can someone explain Newton's second law In an understandable way for a year 10 student

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Newton's second law of motion

**The rate at which momentum change in an object is equal to the net force acting on the object.**

**Net force acting on object = Rate of momentum change in object**

So momentum = mass*velocity

Usually when changing momentum velocity is the most common changing factor since mass is constant most of the times. So then;

Rate of change in momentum = rate of change in velocity

Imagine a situation a ball is rolling on a ground. Lets take it's mass as m and velocity as v1. Then we apply a force on the ball for time of t which result in a velocity change to v2.

So initial momentum of the ball = m*v1

Final momentum of the ball = m*v2

From the Newtons second law,

Force acting on ball = rate of momentum change

= (final momentum-initial momentum)/time

= (m*v2-m*v1)/t

= m(v2-v1)/t

= m*[(v2-v1)/t]

= m*a

Where a is accelaration.

Here (v2-v1)/t = rate of change in velocity = accelaration.

**So simply speaking we can say that the Newton's second law of motion reveals that force acing on a object is equal to the product of its mass and the accelation due to the force.**

Note:

The momentum change can be occured even by change in mass.But it is too complex at this grade.

**Sources:**