Introduction
So, you might be wondering how physics applies to your everyday life. And while there are certainly a lot of complex concepts to learn, the 3 laws of motion are a great place to start.
The first law, inertia, is all about keeping things in motion. If you're driving and want to stop suddenly, the car's inertia will try to keep it going. To overcome this force, you have to apply an equal and opposite force, which is what the brake pedal does.
The second law is acceleration, which is all about how an object's velocity changes over time. If you apply more force to an object, its acceleration will increase. Mathematically, this is represented by the equation F=ma, where F is the force applied to an object, m is its mass, and a is its acceleration.
The third law is momentum, which states that for every action there is an equal and opposite reaction. In other words, when two objects interact, they each exert a force on the other one. This can be seen most clearly in collisions- for example, when two cars crash into each other.
1st Law of motion:
If a body is in rest or in uniform motion it will not change it's state untill and unless an external force is applied on it.
1st law of motion is also called law of inertia.
For instance if a book is on the table, it is in rest it will not move by it's own but we have to apply an external force to move it.
Inertia
Inertia is a basic property of matter, and it's determined by an object's mass. The more mass an object has, the more inertia it has. That's why it's harder to move a heavy object than a light one. It's also why it's hard to stop a moving object. Once an object is in motion, it wants to stay in motion.
There are three laws of motion that are all based on inertia. The first law, known as the law of inertia, states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an outside force. The second law, known as the law of force, states that the acceleration of an object is proportional to the force applied to it. The third law, known as the law of action and reaction, states that for every action there is an equal and opposite reaction.
All of these laws are based on the principle of inertia, and they help us to understand how objects move.
2nd Law of motion:
The second law of motion states that "if a force is applied on a body it produces acceleration in the direction of force".
Force is directly proportional to acceleration.
And the body having mass is inversely proportional to acceleration.
Hence a body having a greater mass will have less velocity and body having light mass will have greater velocity.
F ∝ a
a ∝ 1 / m
By combining both equations :
a ∝ F / m
By removing the sign of proportionality there will be a linear constant which means a will increase with same rate as F / m.
a = kF / m
a = (1) F / m
a = F / m
F = ma
Hence the product of mass and acceleration is called force.
The unit of force is newton.
Third Law of motion:
Third law states that "Every action has equal but opposite reaction".
If a book is on the table the weight of book is downward but table is also applying a force on book called reactional force.
If two bodies interact with each other so the two bodies will apply equal and opposite force on each other.
Conclusion
If you're looking for a quick and easy way to better understand physics, the 3 laws of motion are a great place to start! These laws are essential for understanding how objects move in the physical world, and once you understand them, you can apply them to an almost limitless number of real-life situations.
So what are these laws, and how can they help you better understand physics? Keep reading to find out!
