Pulling is always easier than pushing:
When we push a body, we also press it down. And when we pull a body, we apply a lifting force to that body,
which makes it feel lighter.
Newton's Second Law of Motion states that when a force acts on an object, it will cause the object to accelerate.
The larger the mass of the object, the greater the force will need to be to cause it to accelerate. The Second Law gives us an exact relationship between force, mass, and acceleration.
This is sometimes summarized by saying that under Newton, F = ma, Thus, according to Newton an object with a certain velocity maintains that velocity unless a force acts on it to cause an acceleration (that is, a change in the velocity).
It can also be stated as, the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Linear momentum of a body is defined as the product of mass and velocity of the body. Linear momentum is often referred to simply as momentum. Velocity is a vector quantity and mass is a scalar quantity. Thus, the momentum is a product of a scalar and a vector.
Newton's second law of motion also enables us to define another physical quantity called impulse. Since some external force has to act on a body, in order to change its state of motion, the instantaneous momentum change can be calculated.