Simplifying Laws of Motion (Newton’s Laws of Motion)
Newton’s laws of motion have always remained one of the most crucial concepts in Physics. However, not many students are able to grasp the basics of these laws and end up getting confused and frustrated when the exams are around the corner.
If you are one of those students, here is a good news for you. For your convenience and better understanding, we have molded the tough language used in Physics notebooks and tried to simplify the laws of motion. So, read them along and practice well in your IIT JEE test series!
Newton’s First Law of Motion
“Every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it.”
This is the accurate statement that tells us about the first law of motion which is often called as “the law of inertia”. But isn’t this filled with too many complicated words that can make your mind go “what?”. Well, we know the pain, so here is a simpler version of this statement.
Any object, be it a ball or even a feather, will do what it is doing unless some external force interrupts it. Think that you are an object. So, if you are sitting on a sofa, then you will remain sitting unless your brother comes and pushes you off the sofa. The same is the case with you are moving across the road. You won’t come at rest until there is an external force acting upon you.
Newton’s Second Law of Motion
“Force is equal to the change in momentum (mV) per change in time. For a constant mass, force equals mass times acceleration.”
Force is a push or pull action that can change the velocity of an object. According to the second law of motion, force that you need to exert to bring a change in a body is equal to the product of its mass and acceleration. Moreover, it also shows that if you put same force on different objects, there will be different motions.
For instance, if you want to move a TV or a ball, you need different energy levels which will certainly be more for a TV. The reason? Well, the more the mass, the harder to move. Similarly, it is easy to stop a football than a fired bullet. The reason? Well, the more the velocity, the harder to stop.
Newton’s Third Law of Motion
“For every action, there is an equal and opposite reaction.”
FAB = – FBA
Finally, a law by Newton with easy vocabulary offering easy understanding to the poor souls. It means that when two bodies interact, they apply forces that are equal in magnitude but opposite in direction. So, when you sit on a chair, the chair also exerts the same amount of force that your body exerts on it. This is why you are able to sit comfortably; else it will collapse. Rocket propulsion another good example to understand Newton’s third law of motion. There needs to be an equilibrium of the forces which conforms to the fundamental symmetries of the universe.
Read it all? Then we are sure Newton’s laws of motion won’t bother anymore. Just practice the formulas of these laws of motion, and you can even become master of the questions you need to solve in your IIT exam. Physics is an interesting science if you start relating it to your daily life. Moreover, once you have mastered it, you will automatically start scoring well not just your IIT JEE test series but in your final exams too. All the best!