# Newtons second law of motion

Newton's second law: Law of Motion
The rate of change of momentum of a body is equal to the resultant force acting on the body and is in the same direction.
Newton's second law as originally stated in terms of momentum p
“An applied force is equal to the rate of change of momentum”.

The physical meaning of this equation is simply a mathematical definition of a force (rate of change of momentum is called a force).
where
F is the force
p is the momentum
t is the time
v is the velocity
m is the mass
a = is the acceleration.
When the mass m, of the object is constant, the mathematical result of differentiation of momentum becomes simply:

If the mass m is measured in kilograms and the acceleration a is measured in meters per second squared, then the unit of force is kilogram × meter/second squared. This unit is called the Newton: 1 N = 1 kg x 1 m/s².

Newton's Second Law