Newton's laws of motion are a set of fundamental principles that describe the behavior of objects in motion. They were first formulated by the English mathematician and physicist Sir Isaac Newton in the 17th century, and they laid the groundwork for the modern understanding of classical mechanics.
There are three laws of motion, which are as follows:
The first law of motion (also known as the law of inertia) states that an object at rest will remain at rest, and an object in motion will continue in motion with a constant velocity, unless acted upon by an external force.
The second law of motion relates the force applied to an object to its mass and acceleration. It states that the force acting on an object is equal to its mass times its acceleration: F = m*a.
The third law of motion (also known as the law of action and reaction) states that for every action, there is an equal and opposite reaction. This means that whenever one object exerts a force on another object, the second object exerts an equal and opposite force on the first object.
Together, these laws provide a framework for understanding the behavior of objects in motion, and they have been used to develop many of the technologies that we rely on today, from airplanes and cars to space shuttles and satellites.
1. PHYSICS For IIT-JEE & NEET
Newton’s Law Of Motion
(NLM)
Basics Introduction Of Newton’s First law
And Second Law with applications
2. Newton‘s Law Of Motion [NLM]
Force:- push/pull
The Consequence of force may be –
1) Increase or decrease speed of moving body
2) Bringing a moving body to rest
2) Changing the direction of moving body
Force -> SI unit Newton
CGS unit Dyne
Force have – i) Magnitude
ii) Direction
iii) Point of application
3. Types of Force
Contact Force Electromagnetic Gravitational Force Nuclear force
Force
Normal Friction Tension
4. Newton’s First Law Of Motion
(Law Of Inertia)
According to this law “A system will remain in its state of rest or of uniform motion unless
a net external force act on it.
1 st law can also be stated as “If the net external force acting on a body is zero, only then
the body remains at rest.”
Free Body Diagram (FBD) :-
m
5. m
Normal Force It is the component of contact force perpendicular to the surface.
It measures how strongly the surfaces in contact are pressed against
each other.
For Normal Force --
1. Touch is necessary
2. The direction of normal s.t it try to compress the body on which
it acts.
11. Tension : Tension in a string is an electromagnetic force. It arises when a string is pulled.
If a massless string is not pulled, tension in it is zero.
2Kg
37
Q. Find tension in string?
12. Newton’s Second Law
Newton’s second law states, “The rate of change of a momentum of a body is directly proportional
to the applied force and takes place in the direction in which the force acts”
13. Application of Newton’s Second law
Q. Find acceleration and normal between the blocks?
3Kg
2Kg
50N
![Newton‘s Law Of Motion [NLM]
Force:- push/pull
The Consequence of force may be –
1) Increase or decrease speed of moving body
2) Bringing a moving body to rest
2) Changing the direction of moving body
Force -> SI unit Newton
CGS unit Dyne
Force have – i) Magnitude
ii) Direction
iii) Point of application](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)