Newton’s Law of Motion

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Newton’s Law of Motion 2018-05-10T12:16:25+00:00

One of the most complex subject in the known Universe which is the literal cause of everything. The subject like electromagnetism thanks to which your mobile phone works or law of attraction and motion the one which states that even if you are ugly the universe will be attracted towards you and your actions. The universe and the multilayer of the unknown are little known to us due to PHYSICS.

Physics have described how electric and magnetic fields are in fact the same thing and many more interesting topics. It has thermodynamics that warned us of the fact that one should not jump in lava. Here not only things that are scientific are conveyed but also things that effects our day to day lives such as Chaos theory that determines the how your life would be if taken different choices or acted differently. Physics also talks vastly on optics which is the study of the behavior of light. The next stop will be relativity which if I speak relatively at some point disturbed the thesis provided by Newton. Newton who said gravity was a force was rectified with relative theory, denoted by relativity it was made to understand later that it is the curvature of space-time itself. Physics has a lot to offer but then here if we start taking every aspect of it we would never end. So today we are going to talk about one aspect and one topic that have a major influence on our day to day lifestyle.
The topic of gravity, mass, and force is quite familiar to us and to top that Newton’s Law of motion is on everyone’s tongue tip. Here we will discuss more the law, it’s implication and for example well try to understand it in an elaborate sense. Let get started then. We talk a lot about how things work and take the normal course of action and we know that all things depend on Law of motion. May it is the ball that has been thrown into the air and you are trying to determine and predict how exactly it will fall. But there had been something that we ignore to investigate: FORCES, and why this phenomenon results in an acceleration of different objects. Physicist Isaac Newton published three laws of motion in his book Principia, he outlined and chalked down his understanding and research of motion and drew many conclusions. The ideas presented by Isaac Newton were relatively and reasonably sound and were totally new.
Today, 300 years later if you are trying to describe the effects of forces on every object such as a box on the ground, a bullock pulling a cart or a reindeer pulling a sleigh, maybe an elevator taking you up to your apartment. You would need to refer and take the aid of Newton’s law of motion to get the answer to all your questions.
The Laws of Motion
First Law of Motion (Inertia)
Newton’s First law of motion is all about inertia, which basically speaks of the fact that “An object in motion, will remain in motion and an object at rest is continue to remain on rest until and unless an external force is applied to the object in rest or in motion unless acted upon by a force”. In other words, to change the way something moves, to give it acceleration we need a net force. Now the question will arise here of how do we measure inertia? To answer this question, one needs to understand mass. Say for example you have to ball one bowling ball and one beach ball, due to variation in mass the bowling ball will be tough to move and will take much force to bring it to rest whereas due to less weight beachball is quite easy to move and take little force to come to a halt. So, the inertia is dependable on the mass of the object.

Second Law of Motion (Net force is equal to Mass time acceleration)
Newton second law of motion is dramatically connected with the first law of motion. To understand it better let’s review the second law of motion. Newton second law o motion state that “Net force applied is equal to mass multiplied by acceleration”. In equation it is F(net) = ma. It is very important to remember that we are talking about the net force here. The amount of force left over, once we added together all the forces that might cancel each other out. Let us take an example, let say you have a perfectly frictionless ice rink and on that, you have a hockey puck.

We know ice is not entirely frictionless but then let’s take it into consideration for this example. If you push the puck along with a stick, which is the acted force on it that is not canceled out by anything else. In the case, the puck will experience acceleration. When the puck is still or sliding in the ice when pushed all the forces are balanced out this phenomenon is also known as Equilibrium. So to understand it in simple term, an object that is in equilibrium will keep on moving along with it the velocity will also remain constant. It is when the forces are unbalanced then only use will get to see the change. The best example of the net force is making something move is the gravitational force, and the gravitation pulls measured on the weight in Newtons in the honor of Sir Isaac Newton, and not in the kilogram.

Third law of Motion (every action has an equal and opposite reaction)
The third law of motion we all have heard about and even many memes are made on it. The third law of motion states that “every action has an equal and opposite reaction”. It means when you exert a force on an object it exerts the same amount of force back on you. It force is also known as normal force, normal in this instance is known as perpendicular force. The truth is the normal force is always perpendicular to whatever surface your object is resting on. You might start asking when the force is applied to us in the same amount we apply force to an object, so how can we pick up an object without any problem? The answer is, basically the things can move because there is more going on than just the action and reaction forces. For example, when a reindeer pulls on a sleigh, Newton’s third law of motion says that the sleigh is pulling back on it with equal force.

But the reindeer still able to pull the sleigh as it is standing on the ground. The force from the ground that is pushing the reindeer forward plus the force applied by the reindeer on the sleigh together exceed the force applied by the sleigh. It is interesting to know that while determining the forces we draw a free body diagram is quite simple and use an arrow to describe forces on the object from the different direction along with the positive and the negative forces. Say you have a box on the top of a table the force exerted by the box on the table and the force exerted by the table on the box is equal. In this case, the net force is 0 as there is no acceleration on the box but what if the same box is hanging with a rope from the ceiling? The net force will remain zero and the gravitational pull was acting like before. Here the counteracting upward force comes from the rope acting on the box, in what we call the tension force. Most of the question paper will assume that the rope has no mass and are completely unbreakable to make simpler examples.

In this blog we almost understand Newton’s three law of motion, how inertia work, the net force is equal to mass multiplied by acceleration, how physicist defines equilibrium and all about the normal force and the tension force. Piruby brings to you the ultimate hack for all your physics worries and to help you understand complex topic it has the best state of the art facility that will indulge you in fun and active learning sessions. Along with it, Piruby also has study material and online tutor who will help you resolve all your complex queries.

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