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Newton’s Law of motion are the three physical laws that are the most important aspects to understand the science of kinematics. These three Newton’s Laws describe the relationship between the movement of an object and the force acting on it. They are essential because they form the basis of classical mechanics, one of the main branches of physics. It was Sir Isaac Newton who established these laws and used these laws to explain many physical systems and phenomena. In this article, we will discuss all three Newton’s Laws of motion and give examples of how we apply these laws in our daily lives.
Newton’s First Law
According to Newton’s First Law any object that stays at rest will be at rest, and any object that is in motion will remain in motion, unless it is disturbed by a net outer force.
It means that the movement cannot change or will decrease without any effect of an unbalanced external force. If nothing happens to you, you will never go anywhere. If you are going in any certain direction, unless something happens to you, you will always go in that specific direction forever. That is, if the resultant force (the vector sum of the forces acting on the body) is zero, the speed of the object is constant. When we say the speed of an object is constant, we mean that the magnitude and the direction both are constant.
Formula
According to Newton’s First Law of Motion
Example
Brakes applied by bus driver suddenly
On a bus trip, when the bus driver suddenly presses the brake, we tend to feel a momentary push forward. The reason for this feeling by passengers sitting inside the bus is because of the law of inertia. Due to the inertia of motion, our body continues to maintain a state of motion even after the bus has stopped, thus pushing us forward.
Newton’s Second Law of Motion
Sir Isaac Newton’s First Law of Motion states, A frame at relaxation will continue to be at relaxation, and a frame in movement will be in movement until it’s far acted upon via any outer or external force. Then, what occurs to a frame while an outside force is carried out to it? That scenario is defined by Newton’s Second Law of Motion. According to NASA, this regulation states, Force is identical to the change in momentum in line with change in time. For a regular mass, force equals mass into acceleration. In mathematical form it is written as F = ma, where F equals force, m is mass of object and a is acceleration of object. The math at the back of that is pretty simple. If you double the force, you double the acceleration, however in case you double the mass, you narrow the acceleration in half. Because the acceleration is directly, and mass is inversely proportional.
Formula
According to Newton’s Second laws of motion
F = ma
Where, F = force, m = mass of the object, a = acceleration
Example
Hitting of a ball
A ball develops a certain acceleration after being hitted. The acceleration with which the ball moves is directly proportional to the force acting on it. This means the harder you will hit the ball, the faster it will move, proving Newton’s second law in everyday life.
Newton’s Third Law of Motion
According to Newton, whenever objects A and B interact, they exert force on each other. When you sit in the chair, your body exerts a downward force on the chair, and the chair exerts an upward force on your body. Here are two forces resulting from this interaction: a force on the chair and a force on your body. These two forces are called action force and reaction force and are the subject of Newton’s third law of motion. Basically it stated by Newton’s third law is: for every action, there is an equal and opposite reaction. The statement means that in every interaction there is a pair of forces acting on the two interacting objects. The size of the forces on the first object is equal to the size of the force on the second object. And the direction of the force on the first object is opposite to the direction of the force on the second object. Forces always occur in pairs of equal and opposite reaction-action forces.
Example
Stretching an elastic band
When someone pulls an elastic band, it returns to its authentic position automatically after leaving it. The more distance you pull it, it exerts the extra force. This is identical while you pull or compress a spring respectively. This pull action is stored as energy and is released as a reaction with the same and opposite force.
Conclusion
Newton’s give three important laws of motion that become the root of classical mechanics, it explains every aspect related to rest and motion of any object. Moreover it explains about the force acting on the object and it also explains that every object exerts forces on each other when they are in contact.
