Scientist Newton gave three laws related to force which are important subjects of Newtonian physics or physics.

#### Newton’s First Law

Newton’s first law of force is: If no external force acts, a stationary object will remain at rest, and a moving object will continue to move in a straight path with uniform velocity.

That is, if no force is applied from outside, there will be no change in the kinetic state of the object. Here it is called external force because the force must be applied from outside. Not from within the object. That is, if you sit in a bus and apply force on the bus itself, it will not. Rather, the bus should be pushed from outside.

In practical terms, Newton’s first law gives an idea of the nature of force. That is, force must be applied to change the motion of an object. So we can define force from here.

Also, this formula gives the idea of inertia. If no force acts, the object will remain as it is, from this idea we can also define inertia.

#### Definition of Force

Something that changes or attempts to change the direction of motion or motion of an object.

#### Definition of Inertia

Inertia is the tendency of objects to remain as they are. And if we want to change this inertia what we must apply, that is force.

#### Newton’s Second Law

Newton’s second law of force is: The rate of change of momentum of an object is proportional to the applied force. In the direction in which the force acts, the change in momentum also occurs.

From here we understand – the more force is applied to the object, the more change in its momentum will occur.

#### Newton’s Third Law

Newton’s third law of force is: For every acting force there is an equal and opposite reaction force.

Newton’s third law gives us the idea that whatever action force we apply, there will be an equal and opposite reaction force. That is, if you push a wall with 10 newtons, the wall will also push you back with 10 newtons.

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