Introduction to force:
In physics, a force is any interaction that, when unopposed, will change the motion of an object. Force is expressed with 'F' in physics. It is a vector. So it has both amplitude and direction. Now I will write the relation of the three laws of Newton and write about the four special forces of nature.
Newton's first law:
Every object will remain in rest or uniform motion in a straight line unless compelled to change its state by the action of an external force.
This means an object will remain in rest until we give a force. Again an item going in uniform motion will keep going until we apply any pressure.
Newton's second law:
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction of the net force, and inversely proportional to the mass of the object.
From this, we can say if the mass of the object is being,' the past velocity of the mass is 'u,' and after 't' seconds, it gets a velocity 'v' then the rate of the difference of momentum is-
mv-mu/t
=m(v-u)/t
=ma
Here 'a' is acceleration, and we know that-
a=v-u/t
So we can say if the force is 'F,' then-
F=kma
Here 'k' is a constant. If we take the amplitude of 'k' 1, then-
F=ma
Here the unit of 'F' is 'N.' And the dimension of 'F' is 'MLT-2'.
Newton's third law:
Every action has an equal and opposite reaction.
That means if you apply a force 10 N on a surface, then the body will give you a -10 N force. Here '-10' indicates the pressure is used in the opposite direction of your party.
The four fundamental forces:
1. Gravitational force:
In this universe, every object attracts any other item only for its mass. The power of attraction between them is so low. For this force, any item falls from a height in the earth.
2. Electromagnetic force:
If we take a magnet near an iron, the iron will be attracted by the magnet. This is an electromagnetic force. This is much stronger than the gravitational force(10^36 times).
3. Weak force:
We see that the gamma-ray comes from radioactive materials. This ray comes for the weak point. It works in such a short distance(10^-18 m). This is a trillion times weaker than the electromagnetic energy.
4. Strong nuclear force:
This is the force between the proton and the neutron of a nucleus. This is the most potent force of the universe. But it works in a short distance(10^-15 m).
The scientists are trying to define the four forces with one formula. In the meantime, they have already determined the weak force and the electromagnetic force with one procedure. This is an excellent discovery in pure physics. You can research for defining the four points with on formula—a brief description I have given about them over.
To know more about force, search for 'Force in physics' in the link below-
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