How does a force work?

Question

FORCE according to Newton never exists by its by itself.
And force only exist on certain occasions.
I is soo ignorant about Newton.
My teacher in physics said that according to Einstein FORCE IS ONLY FICTITIOUS

Answer 1

Yeah, force is just energy applied on a particle. Force per time is power.

Answer 2

You have asked a second most fundamentally important question. The first one would have been the meaning of life. Just kidding 

The force is fictitious? Why don’t you exert some force on your teacher and when the teacher complains ask to explain why the force fictitious. However let us try something else first.

The Sir Isaac Newton and Dr. Albert Einstein what do these men have in common? Both of them pondered the concept of gravity. Newton said that any masses will exert force upon each other and a very real force it will be F=G*M1*M2/R^2. As he said that he forgot to explain how it works and what gravity is.

Then came Albert and introduced a concept of distorted space. The space distorted by mass of the objects and still did not explain GRAVITY. With that notion gravitational force became notionally fictitious since it is not the force between objects that FORCES them together but the distortion in space these objects create.

For more information see the reference supplied.

Have fun!

Answer 3

I believe you are trying to say that every action has an equal and opposite reaction (one of Newton's Laws of Physics). That means that if you apply a force to something (say pressing down on a table), it applies a force to you (the table presses back on your hand, that's why it doesn't collapse when you press on it).

It becomes more confusing when you start talking about energy, because energy comes in all kinds of forms: light, sound, motion, etc. So, for example if you hit a cue ball with a pool cue, it should (in theory) hit the next ball with the same amount of force you hit the cue ball with, and the second ball (lets say the eight-ball) should hit whatever it hits (hopefully the corner pocket) with the same amount of force you used on the cue ball. This is usually not the case, because some of the energy you imparted to the cue ball is lost via friction to the table (this energy is turned into heat, generally speaking), then some more energy is lost in the form of sound by the cue smacking the eight-ball, which will then lose some force via friction to the table before landing smack dab in the center of the corner pocket.

Usually, in a physics class, you can ignore the minor energy losses such as friction and sound. Until you start getting into quantum physics and such, this law is valid. Once you start dealing with atomic subparticles, physics doesn't work the way it does on the macro-atomic level. That's where Einstein comes in, and my physics training ends.

Answer 4

In physics, a classical force is a name given to a net influence that causes a free body with mass to accelerate. A net (or resultant) force which causes such acceleration may be the non-zero additive sum of many different forces acting on a body.

Force is a vector quantity defined as the rate of change of momentum induced in a free body by the net force acting on it, and therefore force has a direction associated with it. The SI unit for force is the newton.

The affect of forces on massless particles is defined in terms of momentum.

Answer 5

if u think in terms of energy then the energy u use to force an object makes it move and this is called work.adn work is also an energy = force * displacement right!
the fundamental thing in our universe is energy and matter.
everything else is linked to this two terms.
and newton was right!