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Centuries ago, Sir Isaac Newton’s revolutionary discovery of the motion of the body and the physical forces acting on the body are till date known as Newton’s Laws. Not only do we utilise these laws for every activity but also they are the basis of many theories of physics. These three laws of motion will help you to understand the behaviour of objects. Whether they are still standing or moving and during any physical force act upon them. In this article, we will describe the meaning of Newton’s laws of motion in brief.
Newton’s first law of motion states that ‘an object or a body at rest or uniform motion will continue to be at rest or uniform motion in a straight line unless an external force of action is compelled to change’. By this statement, Newton was stating that objects or things can not start, stop or change their direction from a straight line by themselves. To change its direction, some physical force must require from outside to causing a movement. This first Newton’s law of motion is also known as the law of Inertia. When massive body properties in their state of motion, resist changes are known as Inertia.
Now, in this first law of motion, you must understand what the crucial point is. And here, the crucial point is, if there is no external force resulting from unbalanced forces acting on a thing or an object, and then the thing or object will maintain a constant velocity. And if velocity is zero, the object will remain at rest, and it is known as Inertia of Rest. If any external force is applied, then velocity will change because of the external force, and it is known as Inertia of Motion. An object or body in motion in a certain fixed direction will continue its motion in that direction until and unless some external act forces it to change its direction and it is known as Inertia of Direction.
Newton’s Second Law of Motion states ‘the acceleration of an object depends upon two variables –one is the net force that acts upon the object, and the other is the mass of the object’. An object’s acceleration directly depends upon the external force upon that object and contrarily upon the mass of that object. When the force is increased, acting upon an object, then the acceleration of the object is also increased. And when the mass of an object increases, then the acceleration of the object is decreased.
This Second Law of Motion explains what happens to the massive body when an external force is acted upon it. It states that the force which is acting on a body is equal to the product of its acceleration and mass.
Newton’s Second Law of Motion can be mathematically represented as:-
‘F’ refers to Force ‘m’ refers to Mass of an Object.
‘a’ refers to the acceleration.
Newton’s 3rd Law of Motion states that ‘every action in nature has an equal and opposite reaction‘. This law of motion is also known as Action-Reaction. When two objects interact, the force that they apply to each other is equal in magnitude and opposite in its direction.
To understand Newton’s Third Law, we can take the help of the following example:
When you row a boat and want to move forward, then you paddle to push the water backwards, and this leads you to move forward. Likewise, when you walk, you shove the surface of the floor using your toes. And the surface of the floor shoves your legs up and helps you to lift your leg.
Ans: The first law of motion states that unless and until a force acts on an object it will not change its motion.
The second law of motion states that a force applied to an object at rest causes it to accelerate in the force direction.
The third law of motion stated that every action in nature has equal and opposite reactions.
Ans: Newton’s third law is also known as Action-Reaction, as it creates an equal part reaction for the action.
Ans: The Law of Gravitation is known as Newton’s 4th Law.
Ans: There are three laws of motion. These are known as Newton’s Laws of Motion.
Newton’s Laws of Motion are very important for all the students to know ‘foundations of classical mechanism’, which is a fundamental chapter in Physics. Newton’s Laws correlate everything you see in your daily life. By these laws of motion, you will be able to think why objects or things move or still sit, why you never fallout from your house floors or why you are not floating on your bed, etc.
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