Monday, 23 December 2019

Laws of Motion By Newton - 3 Laws

  Daman       Monday, 23 December 2019
Sir Issac newton found the three laws of motion by explaining natural phenomena that occur everywhere. Sir kept on practicing on various predictions cases and find successful answers to his questions. Born in 1642, the English physicist and philosopher Sir Isaac Newton, revolutionized the world's understanding of the physical universe, with his three laws.


 He basically inspects various cases and gave a particular name to natural phenomena that are "laws". Since then, a new word is utilized in the field of natural science.



  • Have you ever noticed why engineers take a substantial amount of time in order to construct the curves highways? What exactly the reason behind it. Basically, keeping it comprising, I would say their work on the law of Sir Isaac Newton.

  • You also have noticed that it is is so difficult to take a sharp turn when you turn from a corner. If you do not change the speed of your vehicle then definitely you will have to pay in the hospital.


Keeping such aspects and others, Sir Isaac Newton come up with the new concept of motion which can be explained more deeply with the help of mathematics.

These laws of motions are basically a search behind how matter (object) respond to forces. Some of the laws later invented through multiple observations.


Laws of Motion by Newton


He was successful in describing how phenomenon happens and laws were developed from the chain of data and end up with the development of three laws.

His invention has been transforming the world of science and such inventions has become the basic and fundamental foundation for classical mechanics.

He successfully explains the connection between various objects and numerous forces acting on them.

Making it more clear,

Sir Isaac Newton (1642-1727) made a systematic study of motion and extended the ideas of Galileo. He arrived at three laws which are called Newton's laws of motion.

  • Newton's first law of motion
  • Newton Second law of motion
  • Newton's Third law of motion

  • The first law explains the qualitative force.
  • The second law explains how to calculate the value of force or I can say the amount of force.
  • III law explains a single force can never act. There must be more than one force or I can say in simple words one isolated force doesn't exist.
The existing three laws of motions Firstly comprised of Newton. He basically published research in the year 1687. He closely investigated the different types of motions in objects and systems around them. This combining other laws such as the law of gravitation Kepler's law of planetary motions. All these laws are fruitful in finding out positive results in the various research fields.
Apart from, this a section of scientists also elaborate fourth law.



  • Fourth Law which basically defines forces by adding up like vectors which work on the principle of superposition.

As we can see the numerous objects of different sizes and shapes. So, Newton's law neglect to have a particular focus on these types of motion of an object. His laws exactly work on those objects which can be taken as equivalent to a single mass point. To tackle the concept of a single mass, he worked on making the calculations and come up with the concept of calculus.


  • Truly speaking Newton's law of motion is somehow not appropriate for those objects whose shape can be deformed. Another scientist Euler in the year 1750  explained for Newton's law of motion considering rigid bodies and deformed later become Euler law of motion.

You can understand them well the Euler law when learning differential and integral equation during your classroom.


Another point to consider which can never be neglected is that this law holds to work in a specific frame of reference. It means that the object moves to keep the surroundings constant. In simple words, reference frames are mostly used when we have to specify the concern between moving objects and phenomena under observation.

One thing is to look that Newton's frame is totally and imagination and not based on the values we do in physics. Nowadays, in studies, an observer takes himself as an initial reference and body works with respect to that object.


First Newton's Law of Motion

It states that if none of the force is existing in the surroundings (force of friction force caused by air and (all )). The body does not go to change its state of being rest or moving straight forward.

Newton's First Law

The first law of motion of Newton states that all objects continue in a state of rest or uniform speed in a straight line unless acted upon by a non zero net force. In other words, an object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an outside force.


  • This law can be observed when a tablecloth is whipped from underneath a dinner setting, while the dishes remain in place. Because the dishes were initially at rest, they will continue in their state of rest. 

  • Likewise, when a fast-moving metro train comes to a quick stop, passengers inside the train continue traveling at the previous uniform speed of the train and get thrown forward. 

This property of matter to remain at rest or in motion is known as inertia.

  • Newton's first law is often termed, the law of inertia.
  • Inertia is the property of matter by virtue of which an object continuous in its existing state of rest or uniform motion in a straight line unless an external force changes that state.
Note: Mass is the quantitative measure of inertia.

Read More - Newton's First Law of motion Formula and Examples.


Three Laws of Motion - [Newtons 3 Laws of Motion]


Second Newton's Law of Motion


The second law basically helps us to find out the value of force that how much force is acting on a body. So, we can say that more amount of force acting on a body means the body will faster. In simple terms, the change in the motion is directly proportional to the amount of force acting behind it and its direction is similar to the direction of the force.

Newton's Second Law

Newton's second law states that the acceleration produced by a net force on an object is directly proportional to the net force, is in the same direction as the net force and is inversely proportional to the mass of the object.

Mathematically stated,

A moving object acceleration equals to the net force acting upon the object, divided by the mass of the object, or ‘a’ equals F divided by m.
Three Laws of Motion - [Newtons 3 Laws of Motion]


  • This basically means that it takes a greater force to move or accelerate objects, with greater mass than it does for objects with lesser mass.
  • Force is a vector quantity (Magnitude as well as direction).
  • SI units of Force is Newton.
  • The SI unit of acceleration is ms-2.
  • The CGS unit is cms-2.

This equation dictates that acceleration is directly proportional to force and inversely proportional to mass. When force increases, acceleration increases, and when mass increases, acceleration decreases.

Take an instance, a scenario where you're pushing a 2-kilogram box along the ground, with a force of 20 Newtons. The acceleration of the box equals the 20 N force you exert, divided by the mass 2 kg of the box. The value of acceleration is = 20/2 =10 ms-2


If the mass of the box is increased to 5 N, but the force stays the same, the acceleration will decrease.

This shows that the Mass is inverse proportion, to acceleration.

Read More-

Third Newton's Law of Motion

The third law of motion of newton states everyone knows that an isolated force can never exist. There is always more than one force. I can say mutual actions take place on the body. Simply, to every action, there is an equal and opposite reaction. These two forces can or cannot cancel each other.

Newton's Third Law

The third law of motion of Newton states that whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.

In other words,

For every action, there is an equal and opposite reaction.

When one object pushes against another, the force applied by the first object is opposed by the force of the second object that is equal in magnitude, but in the opposite direction.


  • When you exert a force against a wall, the wall pushes back with an equal force but in the opposite direction.
  • When you take a step and push your foot down against the floor, the floor exerts a force back up to your foot.
Read More- Newton's Third Law of motion Formula and Examples.


  • If the two forces acting on one object. It means that forces will cancel out.
  • If two forces are acting on two different bodies. Then definitely, they are not going to cancel. here Newton's third law, say actually works.


    Physics can be utilized anywhere whether it is a moving skateboard, throwing a basketball, shifting the bedroom furniture and many more. After understanding these laws we got an invention of cars, a better infrastructure and all. Summing up, classical physics explains a completely ideal world with the help of 3 laws of motion. 

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