Newton's Laws of Motion

Newton's 3 Laws of Motion

NEWTON’S FIRST LAW:

According to Newton’s first law of motion, “Every object continues to be in a state of rest or of uniform motion unless an external force is applied to it”.

A particle at rest continues to be at rest or a particle moving with uniform velocity continues to move with uniform velocity only when the net force acting on the particle is zero and if net force acts on a particle then it accelerates.

The inability of a body to change its state by itself is called inertia. Newton’s first law of motion is also called as law of inertia.

NEWTON’S SECOND LAW:

According to Newton’s second law of motion, “the rate of change of linear momentum of a particle is directly proportional to net force on the particle and inversely proportional to mass of the particle”.

F = ma

Here, F= net force applied, m= mass of particle, a= acceleration of particle

So when net force on a body is increased then acceleration also increases, but if mass of body is increased then acceleration decrease.

NEWTON’S THIRD LAW:

According to Newton’s third law of motion, “for every action there is always an equal and opposite reaction”.

Here action and reaction are equal in magnitude and opposite in direction, both will occur simultaneously and there occurs no time gap between them.

Newton’s third law is not applicable to pseudo forces and also leads to the law of conservation of linear momentum.